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class="vector-toc-numb">2</span> <span>Geochemical evidence</span> </div> </a> <ul id="toc-Geochemical_evidence-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fossil_evidence" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Fossil_evidence"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Fossil evidence</span> </div> </a> <button aria-controls="toc-Fossil_evidence-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Fossil evidence subsection</span> </button> <ul id="toc-Fossil_evidence-sublist" class="vector-toc-list"> <li id="toc-Stromatolites" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Stromatolites"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Stromatolites</span> </div> </a> <ul id="toc-Stromatolites-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Microfossils" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Microfossils"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Microfossils</span> </div> </a> <ul id="toc-Microfossils-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Molecular_biomarkers" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Molecular_biomarkers"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Molecular biomarkers</span> </div> </a> <ul id="toc-Molecular_biomarkers-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Genomic_evidence" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Genomic_evidence"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Genomic evidence</span> </div> </a> <ul id="toc-Genomic_evidence-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-RNA_replicators" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#RNA_replicators"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>RNA replicators</span> </div> </a> <ul id="toc-RNA_replicators-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_work_on_early_life" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_work_on_early_life"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Further work on early life</span> </div> </a> <button aria-controls="toc-Further_work_on_early_life-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Further work on early life subsection</span> </button> <ul id="toc-Further_work_on_early_life-sublist" class="vector-toc-list"> <li id="toc-Extraterrestrial_origin_for_early_life" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Extraterrestrial_origin_for_early_life"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.1</span> <span>Extraterrestrial origin for early life</span> </div> </a> <ul id="toc-Extraterrestrial_origin_for_early_life-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Early_life_on_land" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Early_life_on_land"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.2</span> <span>Early life on land</span> </div> </a> <ul id="toc-Early_life_on_land-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Gallery" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Gallery"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Gallery</span> </div> </a> <ul id="toc-Gallery-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet 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Available in 17 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-17" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">17 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Vroegste_bekende_lewensvorme" title="Vroegste bekende lewensvorme – Afrikaans" lang="af" hreflang="af" data-title="Vroegste bekende lewensvorme" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A3%D9%82%D8%AF%D9%85_%D8%A3%D8%B4%D9%83%D8%A7%D9%84_%D8%A7%D9%84%D8%AD%D9%8A%D8%A7%D8%A9_%D8%A7%D9%84%D9%85%D8%B9%D8%B1%D9%88%D9%81%D8%A9" title="أقدم أشكال الحياة المعروفة – Arabic" lang="ar" hreflang="ar" data-title="أقدم أشكال الحياة المعروفة" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A0%CF%81%CF%89%CE%B9%CE%BC%CF%8C%CF%84%CE%B5%CF%81%CE%B5%CF%82_%CE%B3%CE%BD%CF%89%CF%83%CF%84%CE%AD%CF%82_%CE%BC%CE%BF%CF%81%CF%86%CE%AD%CF%82_%CE%B6%CF%89%CE%AE%CF%82" title="Πρωιμότερες γνωστές μορφές ζωής – Greek" lang="el" hreflang="el" data-title="Πρωιμότερες γνωστές μορφές ζωής" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Primeras_formas_de_vida_conocidas" title="Primeras formas de vida conocidas – Spanish" lang="es" hreflang="es" data-title="Primeras formas de vida conocidas" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D9%88%D9%84%DB%8C%D9%86_%D8%B4%D9%88%D8%A7%D9%87%D8%AF_%D8%AD%DB%8C%D8%A7%D8%AA" title="اولین شواهد حیات – Persian" lang="fa" hreflang="fa" data-title="اولین شواهد حیات" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Fossiles_les_plus_anciens" title="Fossiles les plus anciens – French" lang="fr" hreflang="fr" data-title="Fossiles les plus anciens" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BF%D5%B5%D5%A1%D5%B6%D6%84%D5%AB_%D5%A1%D5%B4%D5%A5%D5%B6%D5%A1%D5%B0%D5%AB%D5%B6_%D5%B0%D5%A1%D5%B5%D5%BF%D5%B6%D5%AB_%D5%B1%D6%87%D5%A5%D6%80" title="Կյանքի ամենահին հայտնի ձևեր – Armenian" lang="hy" hreflang="hy" data-title="Կյանքի ամենահին հայտնի ձևեր" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Bentuk_kehidupan_paling_awal_yang_diketahui" title="Bentuk kehidupan paling awal yang diketahui – Indonesian" lang="id" hreflang="id" data-title="Bentuk kehidupan paling awal yang diketahui" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%91%D0%B0%D0%B9%D2%9B%D0%B0%D0%BB%D2%93%D0%B0%D0%BD_%D0%B5%D2%A3_%D0%B5%D0%B6%D0%B5%D0%BB%D0%B3%D1%96_%D1%82%D1%96%D1%80%D1%88%D1%96%D0%BB%D1%96%D0%BA_%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D0%BB%D0%B0%D1%80%D1%8B" title="Байқалған ең ежелгі тіршілік формалары – Kazakh" lang="kk" hreflang="kk" data-title="Байқалған ең ежелгі тіршілік формалары" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Bentuk_kehidupan_paling_awal_yang_diketahui" title="Bentuk kehidupan paling awal yang diketahui – Malay" lang="ms" hreflang="ms" data-title="Bentuk kehidupan paling awal yang diketahui" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Primeiras_formas_de_vida_conhecidas" title="Primeiras formas de vida conhecidas – Portuguese" lang="pt" hreflang="pt" data-title="Primeiras formas de vida conhecidas" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Cele_mai_timpurii_forme_de_via%C8%9B%C4%83" title="Cele mai timpurii forme de viață – Romanian" lang="ro" hreflang="ro" data-title="Cele mai timpurii forme de viață" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%B0%D0%BC%D1%8B%D0%B5_%D1%80%D0%B0%D0%BD%D0%BD%D0%B8%D0%B5_%D0%B8%D0%B7%D0%B2%D0%B5%D1%81%D1%82%D0%BD%D1%8B%D0%B5_%D1%84%D0%BE%D1%80%D0%BC%D1%8B_%D0%B6%D0%B8%D0%B7%D0%BD%D0%B8" title="Самые ранние известные формы жизни – Russian" lang="ru" hreflang="ru" data-title="Самые ранние известные формы жизни" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Earliest_known_life_forms" title="Earliest known life forms – Simple English" lang="en-simple" hreflang="en-simple" data-title="Earliest known life forms" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Yery%C3%BCz%C3%BCndeki_ilk_ya%C5%9Fam" title="Yeryüzündeki ilk yaşam – Turkish" lang="tr" hreflang="tr" data-title="Yeryüzündeki ilk yaşam" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9D%D0%B0%D0%B9%D0%BF%D0%B5%D1%80%D1%88%D1%96_%D0%B2%D1%96%D0%B4%D0%BE%D0%BC%D1%96_%D1%84%D0%BE%D1%80%D0%BC%D0%B8_%D0%B6%D0%B8%D1%82%D1%82%D1%8F" title="Найперші відомі форми життя – Ukrainian" lang="uk" hreflang="uk" data-title="Найперші відомі форми життя" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%B7%B2%E7%9F%A5%E6%9C%80%E5%8F%A4%E8%80%81%E7%9A%84%E7%94%9F%E5%91%BD" title="已知最古老的生命 – Chinese" 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<div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Putative fossilized microorganisms found near hydrothermal vents</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Champagne_vent_white_smokers.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Champagne_vent_white_smokers.jpg/330px-Champagne_vent_white_smokers.jpg" decoding="async" width="330" height="248" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Champagne_vent_white_smokers.jpg/495px-Champagne_vent_white_smokers.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Champagne_vent_white_smokers.jpg/660px-Champagne_vent_white_smokers.jpg 2x" data-file-width="3000" data-file-height="2250" /></a><figcaption>Evidence of possibly the oldest forms of life on Earth has been found in <a href="/wiki/Hydrothermal_vent" title="Hydrothermal vent">hydrothermal vent</a> <a href="/wiki/Precipitates" class="mw-redirect" title="Precipitates">precipitates</a>.<sup id="cite_ref-SCA-20210714_1-0" class="reference"><a href="#cite_note-SCA-20210714-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></figcaption></figure> <p>The <b>earliest known life forms</b> on <a href="/wiki/Earth" title="Earth">Earth</a> may be as old as 4.1 billion years (or <a href="/wiki/Year#SI_prefix_multipliers" title="Year">Ga</a>) according to biologically fractionated <a href="/wiki/Graphite" title="Graphite">graphite</a> inside a single <a href="/wiki/Zircon" title="Zircon">zircon</a> grain in the <a href="/wiki/Jack_Hills" title="Jack Hills">Jack Hills</a> range of <a href="/wiki/Australia" title="Australia">Australia</a>.<sup id="cite_ref-PNAS-20151019_2-0" class="reference"><a href="#cite_note-PNAS-20151019-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The earliest evidence of life found in a <a href="/wiki/Stratigraphic_unit" title="Stratigraphic unit">stratigraphic</a> unit, not just a single <a href="/wiki/Mineral" title="Mineral">mineral</a> grain, is the 3.7 Ga <a href="/wiki/Metasedimentary_rock" title="Metasedimentary rock">metasedimentary</a> rocks containing graphite from the <a href="/wiki/Isua_Greenstone_Belt" title="Isua Greenstone Belt">Isua Supracrustal Belt</a> in <a href="/wiki/Greenland" title="Greenland">Greenland</a>.<sup id="cite_ref-NG-20131208_3-0" class="reference"><a href="#cite_note-NG-20131208-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The earliest direct known life on Earth are <a href="/wiki/Stromatolite" title="Stromatolite">stromatolite</a> fossils which have been found in 3.480-billion-year-old <a href="/wiki/Geyserite" title="Geyserite">geyserite</a> uncovered in the <a href="/wiki/Dresser_Formation" title="Dresser Formation">Dresser</a> Formation of the <a href="/wiki/Pilbara_Craton" title="Pilbara Craton">Pilbara Craton</a> of <a href="/wiki/Western_Australia" title="Western Australia">Western Australia</a>.<sup id="cite_ref-AST-201311082_4-0" class="reference"><a href="#cite_note-AST-201311082-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Various <a href="/wiki/Micropaleontology#Microfossils" title="Micropaleontology">microfossils</a> of <a href="/wiki/Microorganism" title="Microorganism">microorganisms</a> have been found in 3.4 Ga rocks, including 3.465-billion-year-old <a href="/wiki/Pilbara_Craton" title="Pilbara Craton">Apex</a> <a href="/wiki/Chert" title="Chert">chert</a> rocks from the same Australian <a href="/wiki/Craton" title="Craton">craton</a> region,<sup id="cite_ref-PNAS-2017_5-0" class="reference"><a href="#cite_note-PNAS-2017-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> and in 3.42 Ga <a href="/wiki/Hydrothermal_vent" title="Hydrothermal vent">hydrothermal vent</a> <a href="/wiki/Precipitates" class="mw-redirect" title="Precipitates">precipitates</a> from <a href="/wiki/Barberton,_South_Africa" title="Barberton, South Africa">Barberton, South Africa</a>.<sup id="cite_ref-SCA-20210714_1-1" class="reference"><a href="#cite_note-SCA-20210714-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Much later in the geologic record, likely starting in 1.73 Ga, preserved <a href="/wiki/Molecule" title="Molecule">molecular compounds</a> of <a href="/wiki/Life" title="Life">biologic</a> origin are indicative of <a href="/wiki/Aerobic_organism" title="Aerobic organism">aerobic life</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Therefore, the earliest time for the <a href="/wiki/Abiogenesis" title="Abiogenesis">origin of life</a> on Earth is at most 3.5 billion years ago, possibly as early as 4.1 billion years ago — not long after the <a href="/wiki/Ocean" title="Ocean">oceans</a> <a href="/wiki/Origin_of_water_on_Earth#History_of_water_on_Earth" title="Origin of water on Earth">formed 4.5 billion years ago</a> and after the <a href="/wiki/Age_of_Earth" title="Age of Earth">formation of the Earth</a> 4.54 billion years ago.<sup id="cite_ref-USGS1997_7-0" class="reference"><a href="#cite_note-USGS1997-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Biospheres">Biospheres</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=1" title="Edit section: Biospheres"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a> and <a href="/wiki/Biosphere" title="Biosphere">Biosphere</a></div> <p>Earth is the only place in the <a href="/wiki/Universe" title="Universe">universe</a> known to harbor <a href="/wiki/Life" title="Life">life</a>, where it exists in multiple environments.<sup id="cite_ref-NASA-1990_8-0" class="reference"><a href="#cite_note-NASA-1990-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Alterman-2009_9-0" class="reference"><a href="#cite_note-Alterman-2009-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The origin of life on Earth was at least 3.5 billion years ago, possibly as early as 3.8-4.1 billion years ago.<sup id="cite_ref-PNAS-20151019_2-1" class="reference"><a href="#cite_note-PNAS-20151019-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NG-20131208_3-1" class="reference"><a href="#cite_note-NG-20131208-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-AST-201311082_4-1" class="reference"><a href="#cite_note-AST-201311082-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Since its emergence, life has persisted in several geological environments. The Earth's <a href="/wiki/Biosphere" title="Biosphere">biosphere</a> extends down to at least 10 km (6.2 mi) below the seafloor,<sup id="cite_ref-NYT-20181219_10-0" class="reference"><a href="#cite_note-NYT-20181219-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> up to 41–77 km (25–48 mi)<sup id="cite_ref-SA-20191104_12-0" class="reference"><a href="#cite_note-SA-20191104-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> into the <a href="/wiki/Atmosphere_of_Earth" title="Atmosphere of Earth">atmosphere</a>,<sup id="cite_ref-SD-19980625-UG_14-0" class="reference"><a href="#cite_note-SD-19980625-UG-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ABM-20150112_15-0" class="reference"><a href="#cite_note-ABM-20150112-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-BBC-20151124_16-0" class="reference"><a href="#cite_note-BBC-20151124-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> and includes <a href="/wiki/Pedosphere" title="Pedosphere">soil</a>, <a href="/wiki/Hydrothermal_vent#Biological_communities" title="Hydrothermal vent">hydrothermal vents</a>, and <a href="/wiki/Endolith" title="Endolith">rock</a>.<sup id="cite_ref-NC-20200402_17-0" class="reference"><a href="#cite_note-NC-20200402-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-EA-20200402_18-0" class="reference"><a href="#cite_note-EA-20200402-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Further, the biosphere has been found to extend at least 914.4 m (3,000 ft; 0.5682 mi) below the ice of <a href="/wiki/Antarctica" title="Antarctica">Antarctica</a><sup id="cite_ref-FR-20210215_19-0" class="reference"><a href="#cite_note-FR-20210215-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NAT-20140820_20-0" class="reference"><a href="#cite_note-NAT-20140820-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> and includes the <a href="/wiki/Deep_sea#Biology" title="Deep sea">deepest parts of the ocean</a>.<sup id="cite_ref-LS-20130317_21-0" class="reference"><a href="#cite_note-LS-20130317-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NG-20130317_22-0" class="reference"><a href="#cite_note-NG-20130317-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-LS-20130314_23-0" class="reference"><a href="#cite_note-LS-20130314-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-BBC-20141215-RM_24-0" class="reference"><a href="#cite_note-BBC-20141215-RM-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> In July 2020, <a href="/wiki/Marine_biology" title="Marine biology">marine biologists</a> reported that <a href="/wiki/Aerobic_organism" title="Aerobic organism">aerobic</a> <a href="/wiki/Microorganism" title="Microorganism">microorganisms</a> (mainly) in "quasi-<a href="/wiki/Suspended_animation" title="Suspended animation">suspended animation</a>" were found in organically poor <a href="/wiki/Sediment" title="Sediment">sediment</a> 76.2 m (250 ft) below the <a href="/wiki/Seabed" title="Seabed">seafloor</a> in the <a href="/wiki/South_Pacific_Gyre" title="South Pacific Gyre">South Pacific Gyre</a> (SPG) ("the deadest spot in the ocean").<sup id="cite_ref-NC-20200728_25-0" class="reference"><a href="#cite_note-NC-20200728-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Microorganism" title="Microorganism">Microbes</a> have been found in the <a href="/wiki/Atacama_Desert" title="Atacama Desert">Atacama Desert</a> in <a href="/wiki/Chile" title="Chile">Chile</a>, one of the driest places on Earth,<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> and in <a href="/wiki/Hydrothermal_vent_microbial_communities" title="Hydrothermal vent microbial communities">deep-sea hydrothermal vent environments</a> which can reach temperatures over 400°C.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> Microbial communities can also survive in cold <a href="/wiki/Permafrost" title="Permafrost">permafrost</a> conditions down to -25°C.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> Under certain test conditions, life forms have been observed to <a href="/wiki/Panspermia#Counterarguments" title="Panspermia">survive in the vacuum of outer space</a>.<sup id="cite_ref-Dose_29-0" class="reference"><a href="#cite_note-Dose-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Horneck_30-0" class="reference"><a href="#cite_note-Horneck-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> More recently, studies conducted on the <a href="/wiki/International_Space_Station" title="International Space Station">International Space Station</a> found that <a href="/wiki/Bacteria" title="Bacteria">bacteria</a> could survive in <a href="/wiki/Outer_space" title="Outer space">outer space</a>.<sup id="cite_ref-FM-20200826_31-0" class="reference"><a href="#cite_note-FM-20200826-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> In February 2023, findings of a "<a href="/wiki/Dark_microbiome" class="mw-redirect" title="Dark microbiome">dark microbiome</a>" of <a href="/wiki/Microbial_dark_matter" title="Microbial dark matter">microbial dark matter</a> of unfamiliar <a href="/wiki/Microorganism" title="Microorganism">microorganisms</a> in the <a href="/wiki/Atacama_Desert" title="Atacama Desert">Atacama Desert</a> in <a href="/wiki/Chile" title="Chile">Chile</a>, a <a href="/wiki/Mars" title="Mars">Mars</a>-like region of planet <a href="/wiki/Earth" title="Earth">Earth</a>, were reported.<sup id="cite_ref-NC-20230221_32-0" class="reference"><a href="#cite_note-NC-20230221-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Geochemical_evidence">Geochemical evidence</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=2" title="Edit section: Geochemical evidence"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Age_of_Earth" title="Age of Earth">age of Earth</a> is about 4.54 billion years;<sup id="cite_ref-USGS1997_7-1" class="reference"><a href="#cite_note-USGS1997-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago according to the stromatolite record.<sup id="cite_ref-MS-2023_35-0" class="reference"><a href="#cite_note-MS-2023-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> Some computer models suggest life began as early as 4.5 billion years ago.<sup id="cite_ref-PHY-201808203_36-0" class="reference"><a href="#cite_note-PHY-201808203-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NAT-201808203_37-0" class="reference"><a href="#cite_note-NAT-201808203-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> The oldest evidence of life is <i>indirect</i> in the form of <a href="/wiki/Isotope_fractionation" title="Isotope fractionation">isotopic fractionation</a>. Microorganisms will preferentially use the lighter <a href="/wiki/Isotope" title="Isotope">isotope</a> of an atom to build <a href="/wiki/Biomass" title="Biomass">biomass</a>, as it takes less energy to break the bonds for <a href="/wiki/Metabolism" title="Metabolism">metabolic</a> processes.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> Biologic material will often have a composition that is enriched in lighter isotopes compared to the surrounding rock it's found in. <a href="/wiki/Isotopes_of_carbon" title="Isotopes of carbon">Carbon isotopes</a>, expressed scientifically in parts per thousand difference from a standard as <a href="/wiki/%CE%9413C" title="Δ13C">δ<sup>13</sup>C</a>, are frequently used to detect <a href="/wiki/Biological_carbon_fixation" title="Biological carbon fixation">carbon fixation</a> by organisms and assess if purported early life evidence has biological origins. Typically, life will preferentially metabolize the isotopically light <sup>12</sup>C isotope instead of the heavier <sup>13</sup>C isotope. Biologic material can record this fractionation of <a href="/wiki/Carbon" title="Carbon">carbon</a>. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Quartz-pebble_metaconglomerate_(Jack_Hills_Quartzite,_Archean,_2.65_to_3.05_Ga;_Jack_Hills,_Western_Australia)_1_(26668804034).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/74/Quartz-pebble_metaconglomerate_%28Jack_Hills_Quartzite%2C_Archean%2C_2.65_to_3.05_Ga%3B_Jack_Hills%2C_Western_Australia%29_1_%2826668804034%29.jpg/220px-Quartz-pebble_metaconglomerate_%28Jack_Hills_Quartzite%2C_Archean%2C_2.65_to_3.05_Ga%3B_Jack_Hills%2C_Western_Australia%29_1_%2826668804034%29.jpg" decoding="async" width="220" height="214" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/74/Quartz-pebble_metaconglomerate_%28Jack_Hills_Quartzite%2C_Archean%2C_2.65_to_3.05_Ga%3B_Jack_Hills%2C_Western_Australia%29_1_%2826668804034%29.jpg/330px-Quartz-pebble_metaconglomerate_%28Jack_Hills_Quartzite%2C_Archean%2C_2.65_to_3.05_Ga%3B_Jack_Hills%2C_Western_Australia%29_1_%2826668804034%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/74/Quartz-pebble_metaconglomerate_%28Jack_Hills_Quartzite%2C_Archean%2C_2.65_to_3.05_Ga%3B_Jack_Hills%2C_Western_Australia%29_1_%2826668804034%29.jpg/440px-Quartz-pebble_metaconglomerate_%28Jack_Hills_Quartzite%2C_Archean%2C_2.65_to_3.05_Ga%3B_Jack_Hills%2C_Western_Australia%29_1_%2826668804034%29.jpg 2x" data-file-width="2869" data-file-height="2792" /></a><figcaption><a href="/wiki/Zircon" title="Zircon">Zircons</a> in <a href="/wiki/Metaconglomerate" title="Metaconglomerate">metaconglomerates</a> from the <a href="/wiki/Jack_Hills" title="Jack Hills">Jack Hills</a> in Australia show carbon isotopic evidence for early life.</figcaption></figure> <p>The oldest disputed geochemical evidence of life is isotopically light <a href="/wiki/Graphite" title="Graphite">graphite</a> inside a single <a href="/wiki/Zircon" title="Zircon">zircon</a> grain from the <a href="/wiki/Jack_Hills" title="Jack Hills">Jack Hills</a> in Western Australia.<sup id="cite_ref-PNAS-20151019_2-2" class="reference"><a href="#cite_note-PNAS-20151019-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> The graphite showed a δ<sup>13</sup>C signature consistent with biogenic carbon on Earth. Other early evidence of life is found in rocks both from the <a href="/wiki/Akilia" title="Akilia">Akilia</a> Sequence<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> and the <a href="/wiki/Isua_Greenstone_Belt" title="Isua Greenstone Belt">Isua Supracrustal Belt</a> (ISB) in Greenland.<sup id="cite_ref-NG-20131208_3-2" class="reference"><a href="#cite_note-NG-20131208-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Hassenkam-2017_41-0" class="reference"><a href="#cite_note-Hassenkam-2017-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> These 3.7 Ga <a href="/wiki/Metasediment" class="mw-redirect" title="Metasediment">metasedimentary</a> rocks also contain graphite or graphite inclusions with carbon isotope signatures that suggest biological fractionation. </p><p>The primary issue with isotopic evidence of life is that <a href="/wiki/Abiotic_component" title="Abiotic component">abiotic</a> processes can fractionate isotopes and produce similar signatures to biotic processes.<sup id="cite_ref-van_Zuilen-2002_42-0" class="reference"><a href="#cite_note-van_Zuilen-2002-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> Reassessment of the Akilia graphite show that metamorphism, <a href="/wiki/Fischer%E2%80%93Tropsch_process" title="Fischer–Tropsch process">Fischer-Tropsch</a> mechanisms in hydrothermal environments, and volcanic processes may be responsible for enrichment lighter carbon isotopes.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> The ISB rocks that contain the graphite may have experienced a change in composition from hot fluids, i.e. <a href="/wiki/Metasomatism" title="Metasomatism">metasomatism</a>, thus the graphite may have been formed by abiotic chemical reactions.<sup id="cite_ref-van_Zuilen-2002_42-1" class="reference"><a href="#cite_note-van_Zuilen-2002-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> However, the ISB's graphite is generally more accepted as biologic in origin after further <a href="/wiki/Spectral_line" title="Spectral line">spectral</a> analysis.<sup id="cite_ref-NG-20131208_3-3" class="reference"><a href="#cite_note-NG-20131208-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Hassenkam-2017_41-1" class="reference"><a href="#cite_note-Hassenkam-2017-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p><p>Metasedimentary rocks from the 3.5 Ga Dresser Formation, which experienced less metamorphism than the sequences in <a href="/wiki/Greenland" title="Greenland">Greenland</a>, contain better preserved <a href="/wiki/Geochemistry" title="Geochemistry">geochemical</a> evidence.<sup id="cite_ref-Van_Kranendonk-2019_46-0" class="reference"><a href="#cite_note-Van_Kranendonk-2019-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> Carbon isotopes as well as <a href="/wiki/Sulfur" title="Sulfur">sulfur</a> isotopes found in <a href="/wiki/Baryte" title="Baryte">barite</a>, which are <a href="/wiki/Fractionation" title="Fractionation">fractionated</a> by microbial metabolisms during sulfate reduction,<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> are consistent with biological processes.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> However, the Dresser formation was deposited in an active <a href="/wiki/Volcano" title="Volcano">volcanic</a> and <a href="/wiki/Hydrothermal_vent" title="Hydrothermal vent">hydrothermal</a> environment,<sup id="cite_ref-Van_Kranendonk-2019_46-1" class="reference"><a href="#cite_note-Van_Kranendonk-2019-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> and abiotic processes could still be responsible for these fractionations.<sup id="cite_ref-Lollar06_50-0" class="reference"><a href="#cite_note-Lollar06-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> Many of these findings are supplemented by direct evidence, typically by the presence of <a href="/wiki/Microfossils" class="mw-redirect" title="Microfossils">microfossils</a>, however. </p> <div class="mw-heading mw-heading2"><h2 id="Fossil_evidence">Fossil evidence</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=3" title="Edit section: Fossil evidence"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Fossil" title="Fossil">Fossils</a> are direct evidence of life. In the search for the earliest life, fossils are often supplemented by geochemical evidence. The fossil record does not extend as far back as the geochemical record due to metamorphic processes that erase fossils from geologic units. </p> <div class="mw-heading mw-heading3"><h3 id="Stromatolites">Stromatolites</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=4" title="Edit section: Stromatolites"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Stromatolite" title="Stromatolite">Stromatolite</a></div> <p><a href="/wiki/Stromatolite" title="Stromatolite">Stromatolites</a> are laminated sedimentary structures created by <a href="/wiki/Photosynthesis" title="Photosynthesis">photosynthetic</a> organisms as they establish a <a href="/wiki/Microbial_mat" title="Microbial mat">microbial mat</a> on a sediment surface. An important distinction for biogenicity is their convex-up structures and wavy laminations, which are typical of microbial communities who build preferentially toward the sun.<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> A disputed report of stromatolites is from the 3.7 Ga Isua metasediments that show convex-up, conical, and domical morphologies.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NYT-20160831_53-0" class="reference"><a href="#cite_note-NYT-20160831-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NAT-20160922_54-0" class="reference"><a href="#cite_note-NAT-20160922-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> Further mineralogical analysis disagrees with the initial findings of internal convex-up laminae, a critical criterion for stromatolite identification, suggesting that the structures may be deformation features (i.e. <a href="/wiki/Boudinage" title="Boudinage">boudins</a>) caused by extensional <a href="/wiki/Tectonics" title="Tectonics">tectonics</a> in the Isua <a href="/wiki/Supracrustal_rock" title="Supracrustal rock">Supracrustal</a> Belt.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NG-20181017_56-0" class="reference"><a href="#cite_note-NG-20181017-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Stromatolite_-_National_Museum_of_Nature_and_Science,_Tokyo_-_DSC07686.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Stromatolite_-_National_Museum_of_Nature_and_Science%2C_Tokyo_-_DSC07686.JPG/220px-Stromatolite_-_National_Museum_of_Nature_and_Science%2C_Tokyo_-_DSC07686.JPG" decoding="async" width="220" height="153" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Stromatolite_-_National_Museum_of_Nature_and_Science%2C_Tokyo_-_DSC07686.JPG/330px-Stromatolite_-_National_Museum_of_Nature_and_Science%2C_Tokyo_-_DSC07686.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5b/Stromatolite_-_National_Museum_of_Nature_and_Science%2C_Tokyo_-_DSC07686.JPG/440px-Stromatolite_-_National_Museum_of_Nature_and_Science%2C_Tokyo_-_DSC07686.JPG 2x" data-file-width="5193" data-file-height="3605" /></a><figcaption><a href="/wiki/Stromatolite" title="Stromatolite">Stromatolite</a> fossil showing convex-up structures.</figcaption></figure> <p>The earliest direct evidence of life are stromatolites found in 3.48 billion-year-old <a href="/wiki/Chert" title="Chert">chert</a> in the Dresser formation of the Pilbara Craton in Western Australia.<sup id="cite_ref-AST-201311082_4-2" class="reference"><a href="#cite_note-AST-201311082-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Several features in these fossils are difficult to explain with abiotic processes, for example, the thickening of laminae over flexure crests that is expected from more sunlight.<sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> Sulfur isotopes from barite veins in the stromatolites also favor a biologic origin.<sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup> However, while most scientists accept their biogenicity, abiotic explanations for these fossils cannot be fully discarded due to their hydrothermal depositional environment and debated geochemical evidence.<sup id="cite_ref-Lollar06_50-1" class="reference"><a href="#cite_note-Lollar06-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> </p><p>Most <a href="/wiki/Archean" title="Archean">archean</a> stromatolites older than 3.0 Ga are found in Australia or South Africa. Stratiform stromatolites from the Pilbara Craton have been identified in the 3.47 Ga Mount Ada Basalt.<sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Barberton,_South_Africa" title="Barberton, South Africa">Barberton, South Africa</a> hosts stratiform stromatolites in the 3.46 Hooggenoeg, 3.42 Kromberg and 3.33 Ga Mendon Formations of the <a href="/wiki/Onverwacht_Group" title="Onverwacht Group">Onverwacht Group</a>.<sup id="cite_ref-60" class="reference"><a href="#cite_note-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup> The 3.43 Ga <a href="/wiki/Strelley_Pool" class="mw-redirect" title="Strelley Pool">Strelley Pool Formation</a> in Western Australia hosts stromatolites that demonstrate vertical and horizontal changes that may demonstrate microbial communities responding to transient environmental conditions.<sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup> Thus, it is likely <a href="/wiki/Anoxygenic_photosynthesis" title="Anoxygenic photosynthesis">anoxygenic</a> or oxygenic <a href="/wiki/Photosynthesis" title="Photosynthesis">photosynthesis</a> has been occurring since at least 3.43 Ga Strelley Pool Formation.<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Microfossils">Microfossils</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=5" title="Edit section: Microfossils"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Microfossil" title="Microfossil">Microfossil</a></div> <p>Claims of the earliest life using fossilized microorganisms (<a href="/wiki/Micropaleontology#Microfossils" title="Micropaleontology">microfossils</a>) are from <a href="/wiki/Hydrothermal_vent" title="Hydrothermal vent">hydrothermal vent</a> <a href="/wiki/Precipitates" class="mw-redirect" title="Precipitates">precipitates</a> from an ancient sea-bed in the <a href="/wiki/Nuvvuagittuq_Greenstone_Belt" title="Nuvvuagittuq Greenstone Belt">Nuvvuagittuq Belt</a> of Quebec, Canada. These may be as old as 4.28 billion years, which would make it the oldest evidence of life on Earth, suggesting "an almost instantaneous emergence of life" after <a href="/wiki/Origin_of_water_on_Earth#History_of_water_on_Earth" title="Origin of water on Earth">ocean formation 4.41 billion years ago</a>.<sup id="cite_ref-NAT-20170301_64-0" class="reference"><a href="#cite_note-NAT-20170301-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> These findings may be better explained by abiotic processes: for example, silica-rich waters,<sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> "chemical gardens,"<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup> circulating hydrothermal fluids,<sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> and volcanic ejecta<sup id="cite_ref-69" class="reference"><a href="#cite_note-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup> can produce morphologies similar to those presented in Nuvvuagittuq. </p> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Halobacteria.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Halobacteria.jpg/168px-Halobacteria.jpg" decoding="async" width="168" height="151" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Halobacteria.jpg/252px-Halobacteria.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/a/a1/Halobacteria.jpg 2x" data-file-width="280" data-file-height="251" /></a><figcaption><a href="/wiki/Archaea" title="Archaea">Archaea</a> (<a href="/wiki/Prokaryotes" class="mw-redirect" title="Prokaryotes">prokaryotic</a> <a href="/wiki/Microorganism" title="Microorganism">microbes</a>) were first found in <a href="/wiki/Extreme_environment" title="Extreme environment">extreme environments</a>, such as <a href="/wiki/Hydrothermal_vent" title="Hydrothermal vent">hydrothermal vents</a>.</figcaption></figure> <p>The 3.48 Ga Dresser formation hosts microfossils of <a href="/wiki/Prokaryotic_cytoskeleton" title="Prokaryotic cytoskeleton">prokaryotic filaments</a> in silica veins, the earliest fossil evidence of life on Earth,<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup> but their origins may be volcanic.<sup id="cite_ref-71" class="reference"><a href="#cite_note-71"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup> 3.465-billion-year-old <a href="/wiki/Australia" title="Australia">Australian</a> <a href="/wiki/Apex_chert" class="mw-redirect" title="Apex chert">Apex chert</a> rocks may once have contained <a href="/wiki/Microorganism" title="Microorganism">microorganisms</a>,<sup id="cite_ref-WU-20171218_72-0" class="reference"><a href="#cite_note-WU-20171218-72"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-PNAS-2017_5-1" class="reference"><a href="#cite_note-PNAS-2017-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> although the validity of these findings has been contested.<sup id="cite_ref-Brasier_Green_Lindsay_2005_73-0" class="reference"><a href="#cite_note-Brasier_Green_Lindsay_2005-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-74" class="reference"><a href="#cite_note-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> "Putative filamentous microfossils," possibly of <a href="/wiki/Methanogen" title="Methanogen">methanogens</a> and/or <a href="/wiki/Methanotroph" title="Methanotroph">methanotrophs</a> that lived about 3.42-billion-year-old in "a paleo-subseafloor <a href="/wiki/Hydrothermal_circulation#Seafloor_hydrothermal_circulation" title="Hydrothermal circulation">hydrothermal vein system</a> of the <a href="/wiki/Barberton_greenstone_belt" class="mw-redirect" title="Barberton greenstone belt">Barberton greenstone belt</a>, have been identified in <a href="/wiki/South_Africa" title="South Africa">South Africa</a>."<sup id="cite_ref-SCA-20210714_1-2" class="reference"><a href="#cite_note-SCA-20210714-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> A diverse set of microfossil morphologies have been found in the 3.43 Ga Strelley Pool Formation including spheroid, lenticular, and film-like microstructures.<sup id="cite_ref-75" class="reference"><a href="#cite_note-75"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> Their biogenicity are strengthened by their observed chemical preservation.<sup id="cite_ref-76" class="reference"><a href="#cite_note-76"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> The early lithification of these structures allowed important chemical tracers, such as the <a href="/wiki/Carbon-to-nitrogen_ratio" title="Carbon-to-nitrogen ratio">carbon-to-nitrogen ratio</a>, to be retained at levels higher than is typical in older, metamorphosed rock units. </p> <div class="mw-heading mw-heading3"><h3 id="Molecular_biomarkers">Molecular biomarkers</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=6" title="Edit section: Molecular biomarkers"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Biosignature" title="Biosignature">Biosignature</a></div> <p>Biomarkers are compounds of biologic origin found in the geologic record that can be linked to past life.<sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup> Although they aren't preserved until the late Archean, they are important indicators of early <a href="/wiki/Photosynthesis" title="Photosynthesis">photosynthetic</a> life. <a href="/wiki/Lipid" title="Lipid">Lipids</a> are particularly useful biomarkers because they can survive for long periods of geologic time and reconstruct past environments.<sup id="cite_ref-78" class="reference"><a href="#cite_note-78"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Common_lipid_types.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Common_lipid_types.svg/220px-Common_lipid_types.svg.png" decoding="async" width="220" height="243" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Common_lipid_types.svg/330px-Common_lipid_types.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Common_lipid_types.svg/440px-Common_lipid_types.svg.png 2x" data-file-width="1630" data-file-height="1800" /></a><figcaption><a href="/wiki/Lipid" title="Lipid">Lipids</a> are commonly used in geologic studies to find evidence of oxygenic <a href="/wiki/Photosynthesis" title="Photosynthesis">photosynthesis</a>.</figcaption></figure> <p>Fossilized lipids were reported from 2.7 Ga laminated <a href="/wiki/Shale" title="Shale">shales</a> from the Pilbara Craton<sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup> and the 2.67 Ga <a href="/wiki/Kaapvaal_Craton" title="Kaapvaal Craton">Kaapvaal Craton</a> in South Africa.<sup id="cite_ref-80" class="reference"><a href="#cite_note-80"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup> However, the age of these biomarkers and whether their deposition was synchronous with their host rocks were debated,<sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup> and further work showed that the lipids were contaminants.<sup id="cite_ref-82" class="reference"><a href="#cite_note-82"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup> The oldest "clearly indigenous"<sup id="cite_ref-Vinnichenko-2020_83-0" class="reference"><a href="#cite_note-Vinnichenko-2020-83"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> biomarkers are from the 1.64 Ga Barney Creek Formation in the <a href="/wiki/McArthur_Basin" title="McArthur Basin">McArthur Basin</a> in Northern Australia,<sup id="cite_ref-84" class="reference"><a href="#cite_note-84"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-85" class="reference"><a href="#cite_note-85"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup> but <a href="/wiki/Hydrocarbon" title="Hydrocarbon">hydrocarbons</a> from the 1.73 Ga Wollogorang Formation in the same basin have also been detected.<sup id="cite_ref-Vinnichenko-2020_83-1" class="reference"><a href="#cite_note-Vinnichenko-2020-83"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup> </p><p>Other indigenous biomarkers can be dated to the <a href="/wiki/Mesoproterozoic" title="Mesoproterozoic">Mesoproterozoic</a> era (1.6-1.0 Ga). The 1.4 Ga Hongshuizhuang Formation in the <a href="/wiki/North_China_Craton" title="North China Craton">North China Craton</a> contains hydrocarbons in shales that were likely sourced from <a href="/wiki/Prokaryote" title="Prokaryote">prokaryotes</a>.<sup id="cite_ref-86" class="reference"><a href="#cite_note-86"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup> Biomarkers were found in <a href="/wiki/Siltstone" title="Siltstone">siltstones</a> from the 1.38 Ga Roper Group of the McArthur Basin.<sup id="cite_ref-87" class="reference"><a href="#cite_note-87"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup> Hydrocarbons possibly derived from bacteria and algae were reported in 1.37 Ga Xiamaling Formation of the NCC.<sup id="cite_ref-88" class="reference"><a href="#cite_note-88"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup> The 1.1 Ga Atar/El Mreïti Group in the <a href="/wiki/Taoudeni_Basin" title="Taoudeni Basin">Taoudeni Basin</a>, Mauritania show indigenous biomarkers in black shales.<sup id="cite_ref-89" class="reference"><a href="#cite_note-89"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Genomic_evidence">Genomic evidence</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=7" title="Edit section: Genomic evidence"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Last_universal_common_ancestor" title="Last universal common ancestor">Last universal common ancestor</a></div> <p>By <a href="/wiki/Phylogenetic_bracketing" title="Phylogenetic bracketing">comparing the genomes</a> of modern organisms (in the domains <a href="/wiki/Bacteria" title="Bacteria">Bacteria</a> and <a href="/wiki/Archaea" title="Archaea">Archaea</a>), it is evident that there was a <a href="/wiki/Last_universal_common_ancestor" title="Last universal common ancestor">last universal common ancestor</a> (LUCA). LUCA is not thought to be the first life on Earth, but rather the only type of organism of its time to still have living descendants. In 2016, M. C. Weiss and colleagues proposed a minimal set of genes that each occurred in at least two groups of Bacteria and two groups of Archaea. They argued that such a distribution of genes would be unlikely to arise by <a href="/wiki/Horizontal_gene_transfer" title="Horizontal gene transfer">horizontal gene transfer</a>, and so any such genes must have derived from the LUCA.<sup id="cite_ref-nature_90-0" class="reference"><a href="#cite_note-nature-90"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup> A <a href="/wiki/Molecular_clock" title="Molecular clock">molecular clock</a> model suggests that the LUCA may have lived 4.477—4.519 billion years ago, within the <a href="/wiki/Hadean" title="Hadean">Hadean</a> eon.<sup id="cite_ref-PHY-201808203_36-1" class="reference"><a href="#cite_note-PHY-201808203-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NAT-201808203_37-1" class="reference"><a href="#cite_note-NAT-201808203-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="RNA_replicators">RNA replicators</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=8" title="Edit section: RNA replicators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a> and <a href="/wiki/RNA_world" title="RNA world">RNA world</a></div> <p>Model Hadean-like <a href="/wiki/Geothermal_activity" title="Geothermal activity">geothermal</a> <a href="/wiki/Microenvironment_(ecology)" class="mw-redirect" title="Microenvironment (ecology)">microenvironments</a> were demonstrated to have the potential to support the synthesis and replication of <a href="/wiki/RNA" title="RNA">RNA</a> and thus possibly the evolution of primitive life.<sup id="cite_ref-Salditt2023_91-0" class="reference"><a href="#cite_note-Salditt2023-91"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> Porous rock systems, comprising heated air-water interfaces, were shown to facilitate <a href="/wiki/Ribozyme" title="Ribozyme">ribozyme</a> <a href="/wiki/Catalysis" title="Catalysis">catalyzed</a> RNA replication of sense and antisense strands and then subsequent strand-dissociation.<sup id="cite_ref-Salditt2023_91-1" class="reference"><a href="#cite_note-Salditt2023-91"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> This enabled combined synthesis, release and folding of active ribozymes.<sup id="cite_ref-Salditt2023_91-2" class="reference"><a href="#cite_note-Salditt2023-91"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Further_work_on_early_life">Further work on early life</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=9" title="Edit section: Further work on early life"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Extraterrestrial_origin_for_early_life">Extraterrestrial origin for early life</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=10" title="Edit section: Extraterrestrial origin for early life"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Porous_chondriteIDP.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Porous_chondriteIDP.jpg/220px-Porous_chondriteIDP.jpg" decoding="async" width="220" height="146" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Porous_chondriteIDP.jpg/330px-Porous_chondriteIDP.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Porous_chondriteIDP.jpg/440px-Porous_chondriteIDP.jpg 2x" data-file-width="700" data-file-height="466" /></a><figcaption>The theory of <a href="/wiki/Panspermia" title="Panspermia">panspermia</a> speculates that <a href="/wiki/Life" title="Life">life</a> on <a href="/wiki/Earth" title="Earth">Earth</a> may have come from biological matter carried by <a href="/wiki/Space_dust" class="mw-redirect" title="Space dust">space dust</a><sup id="cite_ref-ARX-20171106_92-0" class="reference"><a href="#cite_note-ARX-20171106-92"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup> or <a href="/wiki/Meteorite" title="Meteorite">meteorites</a>.<sup id="cite_ref-SA-20180110_93-0" class="reference"><a href="#cite_note-SA-20180110-93"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup></figcaption></figure> <p>While current geochemical evidence dates the origin of life to possibly as early as 4.1 Ga, and fossil evidence shows life at 3.5 Ga, some researchers speculate that life may have started nearly 4.5 billion years ago.<sup id="cite_ref-PHY-201808203_36-2" class="reference"><a href="#cite_note-PHY-201808203-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NAT-201808203_37-2" class="reference"><a href="#cite_note-NAT-201808203-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> According to biologist <a href="/wiki/Stephen_Blair_Hedges" title="Stephen Blair Hedges">Stephen Blair Hedges</a>, "If life arose relatively quickly on Earth ... then it could be common in the <a href="/wiki/Universe" title="Universe">universe</a>."<sup id="cite_ref-AP-20151019_94-0" class="reference"><a href="#cite_note-AP-20151019-94"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-CSM-20151020_95-0" class="reference"><a href="#cite_note-CSM-20151020-95"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-IND-20171002_96-0" class="reference"><a href="#cite_note-IND-20171002-96"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup> The possibility that terrestrial life forms may have been seeded from outer space has been considered.<sup id="cite_ref-PBMB-20180801_97-0" class="reference"><a href="#cite_note-PBMB-20180801-97"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-SA-20211228_98-0" class="reference"><a href="#cite_note-SA-20211228-98"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> In January 2018, a study found that 4.5 billion-year-old <a href="/wiki/Meteorite" title="Meteorite">meteorites</a> found on Earth contained <a href="/wiki/Water#Liquid_water" title="Water">liquid water</a> along with <a href="/wiki/Abiogensis" class="mw-redirect" title="Abiogensis">prebiotic</a> <a href="/wiki/Organic_compound" title="Organic compound">complex organic substances</a> that may be ingredients for <a href="/wiki/Life" title="Life">life</a>.<sup id="cite_ref-SA-20180110_93-1" class="reference"><a href="#cite_note-SA-20180110-93"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Early_life_on_land">Early life on land</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=11" title="Edit section: Early life on land"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/History_of_life" title="History of life">History of life</a></div> <p>As for life on land, in 2019 scientists reported the discovery of a <a href="/wiki/Fossil" title="Fossil">fossilized</a> <a href="/wiki/Fungus" title="Fungus">fungus</a>, named <i><a href="/wiki/Ourasphaira_giraldae" title="Ourasphaira giraldae">Ourasphaira giraldae</a></i>, in the <a href="/wiki/Northern_Canada" title="Northern Canada">Canadian Arctic</a>, that may have grown on land a billion years ago, well before <a href="/wiki/Plant" title="Plant">plants</a> are thought to have been living on land.<sup id="cite_ref-NYT-20190522_99-0" class="reference"><a href="#cite_note-NYT-20190522-99"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NAT-20190522_100-0" class="reference"><a href="#cite_note-NAT-20190522-100"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Ars_Technica_2019_101-0" class="reference"><a href="#cite_note-Ars_Technica_2019-101"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup> The earliest life on land may have been <a href="/wiki/Bacteria" title="Bacteria">bacteria</a> 3.22 billion years ago.<sup id="cite_ref-NG-20180723_102-0" class="reference"><a href="#cite_note-NG-20180723-102"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup> Evidence of microbial <a href="/wiki/Evolutionary_history_of_life#Colonization_of_land" class="mw-redirect" title="Evolutionary history of life">life on land</a> may have been found in 3.48 billion-year-old <a href="/wiki/Geyserite" title="Geyserite">geyserite</a> in the <a href="/wiki/Pilbara_Craton" title="Pilbara Craton">Pilbara Craton</a> of Western Australia.<sup id="cite_ref-PO-20170509_103-0" class="reference"><a href="#cite_note-PO-20170509-103"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-EA-20190926_104-0" class="reference"><a href="#cite_note-EA-20190926-104"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Gallery">Gallery</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=12" title="Edit section: Gallery"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1256386598">.mw-parser-output .cot-header-mainspace{background:#F0F2F5;color:inherit}.mw-parser-output .cot-header-other{background:#CCFFCC;color:inherit}@media screen{html.skin-theme-clientpref-night .mw-parser-output .cot-header-mainspace{background:#14181F;color:inherit}html.skin-theme-clientpref-night .mw-parser-output .cot-header-other{background:#003500;color:inherit}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cot-header-mainspace{background:#14181F;color:inherit}html.skin-theme-clientpref-os .mw-parser-output .cot-header-other{background:#003500;color:inherit}}</style> <div style="margin-left:0"> <table class="mw-collapsible mw-archivedtalk" style="color:inherit; background: transparent; text-align: left; border: 1px solid Silver; margin: 0.2em auto auto; width:100%; clear: both; padding: 1px;"> <tbody><tr> <th class="cot-header-mainspace" style="; font-size:87%; padding:0.2em 0.3em; text-align:center;"><div style="font-size:115%;margin:0 4em">Earliest known life forms</div> </th></tr> <tr> <td style="color:inherit; border: solid 1px Silver; padding: 0.6em; background: var(--background-color-base, #fff);"> <table id="Container" role="presentation" class="nomobile toccolours searchaux" style="text-align:left;padding:0 0.5em;border-style:solid;float:right;clear:right;margin:0.3em 0 0.8em 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(";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output 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abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist"><span>This box: </span><ul><li class="nv-view"><a href="/wiki/Template:Life_timeline" title="Template:Life timeline"><span title="View this template">view</span></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Life_timeline" title="Template talk:Life timeline"><span title="Discuss this template">talk</span></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Life_timeline" title="Special:EditPage/Template:Life timeline"><span title="Edit this template">edit</span></a></li></ul></div></td></tr><tr style="vertical-align:top"><td id="Scale" style="padding:0;margin:0.7em 0 0.7em 0;width:4.2em;position:relative;float:left;font-size:100%;height:50em;border-right:1px solid #242020"><div style="float:right;position:absolute;right:-1px;top:49.56em;transform:translateY(-50%)"><span style="font-size:90%">−4500 —</span></div><div style="float:right;position:absolute;right:-1px;top:48.18em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:46.81em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:45.43em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:44.05em;transform:translateY(-50%)"><span style="font-size:90%">−4000 —</span></div><div style="float:right;position:absolute;right:-1px;top:42.68em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:41.30em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:39.92em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:38.55em;transform:translateY(-50%)"><span style="font-size:90%">−3500 —</span></div><div style="float:right;position:absolute;right:-1px;top:37.17em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:35.79em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:34.42em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:33.04em;transform:translateY(-50%)"><span style="font-size:90%">−3000 —</span></div><div style="float:right;position:absolute;right:-1px;top:31.66em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:30.29em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:28.91em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:27.53em;transform:translateY(-50%)"><span style="font-size:90%">−2500 —</span></div><div style="float:right;position:absolute;right:-1px;top:26.16em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:24.78em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:23.40em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:22.03em;transform:translateY(-50%)"><span style="font-size:90%">−2000 —</span></div><div style="float:right;position:absolute;right:-1px;top:20.65em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:19.27em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:17.90em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:16.52em;transform:translateY(-50%)"><span style="font-size:90%">−1500 —</span></div><div style="float:right;position:absolute;right:-1px;top:15.14em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:13.77em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:12.39em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:11.01em;transform:translateY(-50%)"><span style="font-size:90%">−1000 —</span></div><div style="float:right;position:absolute;right:-1px;top:9.64em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:8.26em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:6.88em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:5.51em;transform:translateY(-50%)"><span style="font-size:90%">−500 —</span></div><div style="float:right;position:absolute;right:-1px;top:4.13em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:2.75em;transform:translateY(-50%)"><span style="font-size:90%">—</span></div><div style="float:right;position:absolute;right:-1px;top:1.38em;transform:translateY(-50%)"><span style="font-size:90%">–</span></div><div style="float:right;position:absolute;right:-1px;top:0.00em;transform:translateY(-50%)"><span style="font-size:90%">0 —</span></div></td><td id="Timeline" class="toccolours notheme" style="padding:0px;margin:0.7em 0 0.7em 0;position:relative;font-size:100%;width:13em;height:50em;float:left;border:none"><div class="notheme" style="font-size:100%;background-color:#e5cc7f;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:50.000em;left:0.910em;width:12.090em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-25.000em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#aebfd1;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:44.053em;height:4.537em;left:1.040em;width:11.960em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-2.269em;transform:translateY(-50%);z-index:5"><a href="/wiki/Origin_of_water_on_Earth" title="Origin of water on Earth">Water</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#aebfd1;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:44.053em;left:1.040em;width:0.130em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-22.026em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#b3d9ff;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:38.546em;height:5.507em;left:1.170em;width:11.830em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-2.753em;transform:translateY(-50%);z-index:5"><a href="/wiki/Unicellular_organism" title="Unicellular organism">Single-celled life</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#b3d9ff;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:38.546em;left:1.170em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-19.273em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#99ffff;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:23.128em;height:15.419em;left:1.430em;width:11.570em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-7.709em;transform:translateY(-50%);z-index:5"><a href="/wiki/Evolution_of_photosynthesis" title="Evolution of photosynthesis">Photosynthesis</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#99ffff;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:23.128em;left:1.430em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-11.564em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#b3ffea;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:17.621em;height:5.507em;left:1.690em;width:11.310em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-2.753em;transform:translateY(-50%);z-index:5"><a href="/wiki/Eukaryote" title="Eukaryote">Eukaryotes</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#b3ffea;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:17.621em;left:1.690em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-8.811em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ccffe7;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:5.958em;height:11.663em;left:1.950em;width:11.050em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-5.831em;transform:translateY(-50%);z-index:5"><a href="/wiki/Multicellular_organism" title="Multicellular organism">Multicellular life</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ccffe7;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:5.958em;left:1.950em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-2.979em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#77dd00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:1.982em;height:7.379em;left:2.210em;width:1.170em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-3.689em;transform:translateY(-50%);z-index:5"><a href="/wiki/Plant" title="Plant"><span style="display:block; text-align:center; line-height: 0.85em;">P<br />l<br />a<br />n<br />t<br />s</span></a></div></div></div><div class="notheme" style="font-size:100%;background-color:#77dd00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:1.982em;left:2.210em;width:0.260em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-0.991em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ccbbaa;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:2.203em;height:3.756em;left:3.380em;width:9.620em"><div style="font-size:100%;position:relative;top:0.5em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-1.878em;transform:translateY(-50%);z-index:5"><a href="/wiki/Arthropod" title="Arthropod">Arthropods</a> <a href="/wiki/Mollusca" title="Mollusca">Molluscs</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ffff00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:1.982em;left:2.470em;width:3.510em"><div style="font-size:100%;position:relative;top:-0.53em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.991em;transform:translateY(-50%);z-index:5"><a href="/wiki/Flowering_plant#Evolutionary_history" title="Flowering plant">Flowers</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#e6b880;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.721em;height:2.583em;left:3.380em;width:5.070em"><div style="font-size:100%;position:relative;top:0.5em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-1.291em;transform:translateY(-50%);z-index:5"><a href="/wiki/Dinosaur" title="Dinosaur">Dinosaurs</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ffcc00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:2.203em;left:8.580em;width:4.420em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-1.101em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ffcc00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.606em;height:1.597em;left:8.450em;width:4.290em"><div style="font-size:100%;position:relative;top:0.15em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.798em;transform:translateY(-50%);z-index:5"><a href="/wiki/Mammal" title="Mammal">Mammals</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#e6b880;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:1.333em;left:5.980em;width:2.600em"><div style="font-size:100%;position:relative;top:-0.225em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.666em;transform:translateY(-50%);z-index:5"><a href="/wiki/Bird" title="Bird">Birds</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#ffbbbb;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:0.606em;left:8.710em;width:4.030em"><div style="font-size:100%;position:relative;top:0.1em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:90%;vertical-align:middle;display:block;bottom:-0.303em;transform:translateY(-50%);z-index:5"><a href="/wiki/Primate" title="Primate">Primates</a></div></div></div><div class="notheme" style="font-size:100%;background-color:#993c00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:44.053em;height:5.947em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:0em;left:-0.05em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-2.974em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.80em;"><a href="/wiki/Hadean" title="Hadean"><span style="color:#ffffff;">H<br />a<br />d<br />e<br />a<br />n</span></a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#936a00;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:27.533em;height:16.520em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:-1.2em;left:-0.05em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-8.260em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.85em;"><a href="/wiki/Archean" title="Archean"><span style="color:#ffffff;"><br /><br /><br />A<br />r<br />c<br />h<br />e<br />a<br />n</span></a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#f1c309;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:5.958em;height:21.575em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-10.787em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.85em;"><a href="/wiki/Proterozoic" title="Proterozoic"><br /><br /><br /><br /><br /><br /><br />P<br />r<br />o<br />t<br />e<br />r<br />o<br />z<br />o<br />i<br />c</a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#c1e0c1;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:5.958em;left:0.000em;width:0.910em"><div style="font-size:100%;position:relative;top:2em;left:0em"><div class="notheme" style="position:relative;text-align:center;font-size:100%;vertical-align:middle;display:block;bottom:-2.979em;transform:translateY(-50%);z-index:5"><span style="display:block; text-align:center; line-height: 0.85em;"><a href="/wiki/Phanerozoic" title="Phanerozoic">P<br />h<br />a<br />n<br />e<br />r<br />o<br />z<br />o<br />i<br />c</a></span></div></div></div><div class="notheme" style="font-size:100%;background-color:#ccbbaa;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:8.260em;left:12.714em;width:0.286em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-4.130em;transform:translateY(-50%);z-index:5"> </div></div></div><div class="notheme" style="font-size:100%;background-color:#ccbbaa;border-style:none none;position:absolute;text-align:center;margin:0;padding:0;top:0.000em;height:2.203em;left:12.714em;width:0.286em"><div style="font-size:100%;position:relative;top:0em;left:0em"><div class="notheme" style="position:relative;text-align:center;vertical-align:middle;display:block;bottom:-1.101em;transform:translateY(-50%);z-index:5"> </div></div></div></td><td id="Annotations" style="padding:0;margin:0.7em 0 0.7em 0;float:left;position:relative;width:11.05em;height:50em"><table role="presentation" style="position:absolute;z-index:15;top:50.000em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Age_of_Earth" title="Age of Earth">Earth formed</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:48.568em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Origin_of_water_on_Earth" title="Origin of water on Earth">Earliest water</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:47.907em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Last_universal_common_ancestor" title="Last universal common ancestor">LUCA</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:44.053em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a class="mw-selflink selflink">Earliest fossils</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:42.952em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Late_Heavy_Bombardment" title="Late Heavy Bombardment">LHB meteorites</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:38.546em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Geological_history_of_oxygen" title="Geological history of oxygen">Earliest oxygen</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:31.278em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Pongola_glaciation" title="Pongola glaciation">Pongola glaciation</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:25.330em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Great_Oxidation_Event" title="Great Oxidation Event">Atmospheric oxygen</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:24.780em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Huronian_glaciation" title="Huronian glaciation">Huronian glaciation</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:22.026em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Evolution_of_sexual_reproduction#Origin_of_sexual_reproduction" title="Evolution of sexual reproduction">Sexual reproduction</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:17.621em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Francevillian_biota" title="Francevillian biota">Earliest multicellular life</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:16.520em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Evolution_of_fungi" title="Evolution of fungi">Earliest fungi</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:9.361em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.25em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Evolutionary_history_of_plants" title="Evolutionary history of plants">Earliest plants</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:8.260em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.4em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Caveasphaera" title="Caveasphaera">Earliest animals</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:7.489em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Cryogenian" title="Cryogenian">Cryogenian ice age</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:6.993em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Ediacaran_biota" title="Ediacaran biota">Ediacaran biota</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:5.958em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.15em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Cambrian_explosion" title="Cambrian explosion">Cambrian explosion</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:4.956em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.1em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Hirnantian_glaciation" title="Hirnantian glaciation">Hirnantian glaciation</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:4.075em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.1em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Tetrapod" title="Tetrapod">Earliest tetrapods</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:3.304em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.2em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Late_Paleozoic_icehouse" title="Late Paleozoic icehouse">Karoo ice age</a>*</div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:0.275em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:0.3em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Ape" title="Ape">Earliest apes</a> / <a href="/wiki/Human" title="Human">humans</a></div></div></td></tr></tbody></table><table role="presentation" style="position:absolute;z-index:15;top:0.018em;left:0em;transform:translateY(-50%);padding:0;margin:0;font-size:100%"><tbody><tr><td style="padding:0;text-align:left;vertical-align:middle"><span style="color:var( --color-base, #000)">←</span></td><td style="padding:0;text-align:left;vertical-align:middle"><div class="annot-nudge" style="font-size:100%;float:left;position:relative;top:-0.4em"><div style="z-index:10;font-size:90%;color:var( --color-base, #000);display:block;line-height:105%;bottom:0"><a href="/wiki/Quaternary_glaciation" title="Quaternary glaciation">Quaternary ice age</a>*</div></div></td></tr></tbody></table></td></tr><tr><td id="Caption" colspan="3" style="padding:0;margin:0 0.2em 0.7em 0.2em"><div id="Caption" class="toccolours" style="margin:0 0.5em;border-style:none;clear:both;text-align:center;width:26.8em"><div style="float:left;font-size:85%;">(<a href="/wiki/Myr" class="mw-redirect" title="Myr">million years ago</a>)</div><div style="float:right;font-size:95%;">*<i><a href="/wiki/Timeline_of_glaciation" title="Timeline of glaciation">Ice Ages</a></i></div></div></td></tr></tbody></table> <p><br /> </p> <ul class="gallery mw-gallery-packed"> <li class="gallerybox" style="width: 176.66666666667px"> <div class="thumb" style="width: 174.66666666667px;"><span typeof="mw:File"><a href="/wiki/File:Stromatolites_in_Sharkbay.jpg" class="mw-file-description" title="Stromatolites may have been made by microbes moving upward to avoid being smothered by sediment.[54][56]"><img alt="Stromatolites may have been made by microbes moving upward to avoid being smothered by sediment.[54][56]" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Stromatolites_in_Sharkbay.jpg/262px-Stromatolites_in_Sharkbay.jpg" decoding="async" width="175" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Stromatolites_in_Sharkbay.jpg/394px-Stromatolites_in_Sharkbay.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Stromatolites_in_Sharkbay.jpg/524px-Stromatolites_in_Sharkbay.jpg 2x" data-file-width="2440" data-file-height="1816" /></a></span></div> <div class="gallerytext"><a href="/wiki/Stromatolite" title="Stromatolite">Stromatolites</a> may have been made by <a href="/wiki/Microbe" class="mw-redirect" title="Microbe">microbes</a> moving upward to avoid being smothered by <a href="/wiki/Sediment" title="Sediment">sediment</a>.<sup id="cite_ref-NAT-20160922_54-1" class="reference"><a href="#cite_note-NAT-20160922-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-NG-20181017_56-1" class="reference"><a href="#cite_note-NG-20181017-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup></div> </li> <li class="gallerybox" style="width: 194.66666666667px"> <div class="thumb" style="width: 192.66666666667px;"><span typeof="mw:File"><a href="/wiki/File:Stromatolites.jpg" class="mw-file-description" title="Stromatolites left behind by cyanobacteria are one of the oldest fossils of life on Earth."><img alt="Stromatolites left behind by cyanobacteria are one of the oldest fossils of life on Earth." src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Stromatolites.jpg/289px-Stromatolites.jpg" decoding="async" width="193" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Stromatolites.jpg/435px-Stromatolites.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/c/c0/Stromatolites.jpg 2x" data-file-width="550" data-file-height="371" /></a></span></div> <div class="gallerytext"><a href="/wiki/Stromatolite" title="Stromatolite">Stromatolites</a> left behind by <a href="/wiki/Cyanobacteria" title="Cyanobacteria">cyanobacteria</a> are one of the oldest fossils of life on Earth.</div> </li> <li class="gallerybox" style="width: 175.33333333333px"> <div class="thumb" style="width: 173.33333333333px;"><span typeof="mw:File"><a href="/wiki/File:Cyanobacterial-algal_mat.jpg" class="mw-file-description" title="The cyanobacterial-algal mat, salty lake on the White Sea seaside"><img alt="The cyanobacterial-algal mat, salty lake on the White Sea seaside" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Cyanobacterial-algal_mat.jpg/260px-Cyanobacterial-algal_mat.jpg" decoding="async" width="174" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Cyanobacterial-algal_mat.jpg/391px-Cyanobacterial-algal_mat.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Cyanobacterial-algal_mat.jpg/520px-Cyanobacterial-algal_mat.jpg 2x" data-file-width="1200" data-file-height="900" /></a></span></div> <div class="gallerytext">The <a href="/wiki/Cyanobacterial" class="mw-redirect" title="Cyanobacterial">cyanobacterial</a>-algal mat, salty lake on the <a href="/wiki/White_Sea" title="White Sea">White Sea</a> seaside</div> </li> </ul> <ul class="gallery mw-gallery-packed"> <li class="gallerybox" style="width: 175.33333333333px"> <div class="thumb" style="width: 173.33333333333px;"><span typeof="mw:File"><a href="/wiki/File:PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg" class="mw-file-description" title="Microbialites in the Lake Salda rocks of Turkey"><img alt="Microbialites in the Lake Salda rocks of Turkey" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/20/PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg/260px-PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg" decoding="async" width="174" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/20/PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg/391px-PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/20/PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg/520px-PIA24374-Mars-SearchForLife-LakeSaldaTurkey-20210127.jpg 2x" data-file-width="1024" data-file-height="768" /></a></span></div> <div class="gallerytext"><a href="/wiki/Microbialite" title="Microbialite">Microbialites</a> in the <a href="/wiki/Lake_Salda" title="Lake Salda">Lake Salda</a> rocks of <a href="/wiki/Turkey" title="Turkey">Turkey</a></div> </li> <li class="gallerybox" style="width: 236px"> <div class="thumb" style="width: 234px;"><span typeof="mw:File"><a href="/wiki/File:Runzelmarken.jpg" class="mw-file-description" title="Wrinkled Kinneyia-type sedimentary structures formed beneath cohesive microbial mats in peritidal zones.[105]"><img alt="Wrinkled Kinneyia-type sedimentary structures formed beneath cohesive microbial mats in peritidal zones.[105]" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Runzelmarken.jpg/351px-Runzelmarken.jpg" decoding="async" width="234" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Runzelmarken.jpg/528px-Runzelmarken.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/92/Runzelmarken.jpg/702px-Runzelmarken.jpg 2x" data-file-width="3332" data-file-height="1852" /></a></span></div> <div class="gallerytext"><a href="/wiki/Sediment" title="Sediment">Wrinkled Kinneyia-type sedimentary structures</a> formed beneath cohesive <a href="/wiki/Microbial_mat" title="Microbial mat">microbial mats</a> in <a href="/wiki/Intertidal_zone" title="Intertidal zone">peritidal zones</a>.<sup id="cite_ref-Porada2008_105-0" class="reference"><a href="#cite_note-Porada2008-105"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup></div> </li> <li class="gallerybox" style="width: 182px"> <div class="thumb" style="width: 180px;"><span typeof="mw:File"><a href="/wiki/File:Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg" class="mw-file-description" title="Kinneyia-like structure in the Grimsby Formation (Silurian) exposed in Niagara Gorge, NY"><img alt="Kinneyia-like structure in the Grimsby Formation (Silurian) exposed in Niagara Gorge, NY" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg/270px-Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg" decoding="async" width="180" height="130" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg/405px-Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg/539px-Kinneyia_Grimsby_Silurian_Niagara_Gorge.jpg 2x" data-file-width="3200" data-file-height="2316" /></a></span></div> <div class="gallerytext"><a href="/wiki/Microbial_mat" title="Microbial mat"><i>Kinneyia</i>-like structure</a> in the <a href="/wiki/Grimsby_Formation" title="Grimsby Formation">Grimsby Formation</a> (Silurian) exposed in <a href="/wiki/Niagara_Gorge" title="Niagara Gorge">Niagara Gorge</a>, NY</div> </li> </ul> </td></tr></tbody></table></div> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=13" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a></li> <li><a href="/wiki/Creation_myth" title="Creation myth">Creation myth</a></li> <li><a href="/wiki/Extremophile" title="Extremophile">Extremophile</a></li> <li><a href="/wiki/First_universal_common_ancestor" title="First universal common ancestor">First universal common ancestor</a></li> <li><a href="/wiki/Hypothetical_types_of_biochemistry" title="Hypothetical types of biochemistry">Hypothetical types of biochemistry</a></li> <li><a href="/wiki/List_of_longest-living_organisms" title="List of longest-living organisms">List of longest-living organisms</a></li> <li><a href="/wiki/Oldest_dated_rocks" title="Oldest dated rocks">Oldest dated rocks</a></li> <li><a href="/wiki/Outline_of_biology" title="Outline of biology">Outline of biology</a></li> <li><a href="/wiki/Outline_of_life_forms" title="Outline of life forms">Outline of life forms</a></li> <li><a href="/wiki/Timeline_of_the_evolutionary_history_of_life" title="Timeline of the evolutionary history of life">Timeline of the evolutionary history of life</a></li> <li><a href="/wiki/Viroid" title="Viroid">Viroid</a></li> <li><a href="/wiki/Virus" title="Virus">Virus</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Earliest_known_life_forms&action=edit&section=14" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 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Universe"</span></a> on <a href="/wiki/YouTube_video_(identifier)" class="mw-redirect" title="YouTube video (identifier)">YouTube</a> — <a href="/wiki/Gary_Ruvkun" title="Gary Ruvkun">Gary Ruvkun</a>, 2019.</li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output 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<li><a href="/wiki/Scientific_theory" title="Scientific theory"> Theory</a></li> <li><a href="/wiki/Scientific_law" title="Scientific law"> Law</a></li> <li><a href="/wiki/Peer_review" title="Peer review">Peer review</a></li> <li><a href="/wiki/List_of_biology_journals" title="List of biology journals">Biology journals</a></li> <li><a href="/wiki/Common_name" title="Common name">Common name</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Chemical basis</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Atom" title="Atom">Atoms</a></li> <li><a href="/wiki/Amino_acid" title="Amino acid">Amino acids</a></li> <li><a href="/wiki/Carbohydrate" title="Carbohydrate">Carbohydrates</a></li> <li><a href="/wiki/Chemical_bond" title="Chemical bond">Chemical bond</a></li> <li><a href="/wiki/Chemical_element" title="Chemical element">Chemical element</a></li> <li><a href="/wiki/Lipid" title="Lipid">Lipids</a></li> <li><a href="/wiki/Matter" title="Matter">Matter</a> <ul><li><a href="/wiki/Quantum_biology" title="Quantum biology">Quantum</a></li></ul></li> <li><a href="/wiki/Molecule" title="Molecule">Molecules</a></li> <li><a href="/wiki/Monomer" title="Monomer">Monomer</a></li> <li><a href="/wiki/Nucleic_acid" title="Nucleic acid">Nucleic acids</a></li> <li><a href="/wiki/Organic_compound" title="Organic compound">Organic compounds</a></li> <li><a href="/wiki/PH" title="PH">pH</a></li> <li><a href="/wiki/Polymer" title="Polymer">Polymer</a></li> <li><a href="/wiki/Protein" title="Protein">Proteins</a></li> <li><a href="/wiki/Water" title="Water">Water</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Cell_(biology)" title="Cell (biology)">Cells</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Adenosine_triphosphate" title="Adenosine triphosphate">ATP</a></li> <li><a href="/wiki/Cell_cycle" title="Cell cycle">Cell cycle</a></li> <li><a href="/wiki/Cell_theory" title="Cell theory">Cell theory</a></li> <li><a href="/wiki/Cell_signaling" title="Cell signaling">Cell signaling</a></li> <li><a href="/wiki/Cellular_respiration" title="Cellular respiration">Cellular respiration</a></li> <li><a href="/wiki/Energy" title="Energy">Energy transformation</a></li> <li><a href="/wiki/Enzyme" title="Enzyme">Enzyme</a></li> <li><a href="/wiki/Eukaryote" title="Eukaryote">Eukaryote</a></li> <li><a href="/wiki/Fermentation" title="Fermentation">Fermentation</a></li> <li><a href="/wiki/Metabolism" title="Metabolism">Metabolism</a></li> <li><a href="/wiki/Meiosis" title="Meiosis">Meiosis</a></li> <li><a href="/wiki/Mitosis" title="Mitosis">Mitosis</a></li> <li><a href="/wiki/Photosynthesis" title="Photosynthesis">Photosynthesis</a></li> <li><a href="/wiki/Prokaryote" title="Prokaryote">Prokaryote</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Genetics" title="Genetics">Genetics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/DNA" title="DNA">DNA</a></li> <li><a href="/wiki/Epigenetics" title="Epigenetics">Epigenetics</a></li> <li><a href="/wiki/Evolutionary_developmental_biology" title="Evolutionary developmental biology">Evolutionary developmental biology</a></li> <li><a href="/wiki/Gene_expression" title="Gene expression">Gene expression</a></li> <li><a href="/wiki/Regulation_of_gene_expression" title="Regulation of gene expression">Gene regulation</a></li> <li><a href="/wiki/Genome" title="Genome">Genomes</a></li> <li><a href="/wiki/Mendelian_inheritance" title="Mendelian inheritance">Mendelian inheritance</a></li> <li><a href="/wiki/Post-transcriptional_modification" title="Post-transcriptional modification">Post-transcriptional modification</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Evolution" title="Evolution">Evolution</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Adaptation" title="Adaptation">Adaptation</a></li> <li><a class="mw-selflink selflink">Earliest known life forms</a></li> <li><a href="/wiki/Function_(biology)" title="Function (biology)">Function</a></li> <li><a href="/wiki/Genetic_drift" title="Genetic drift">Genetic drift</a></li> <li><a href="/wiki/Gene_flow" title="Gene flow">Gene flow</a></li> <li><a href="/wiki/History_of_life" title="History of life">History of life</a></li> <li><a href="/wiki/Macroevolution" title="Macroevolution">Macroevolution</a></li> <li><a href="/wiki/Microevolution" title="Microevolution">Microevolution</a></li> <li><a href="/wiki/Mutation" title="Mutation">Mutation</a></li> <li><a href="/wiki/Natural_selection" title="Natural selection">Natural selection</a></li> <li><a href="/wiki/Phylogenetics" title="Phylogenetics">Phylogenetics</a></li> <li><a href="/wiki/Speciation" title="Speciation">Speciation</a></li> <li><a href="/wiki/Taxonomy_(biology)" title="Taxonomy (biology)">Taxonomy</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Biodiversity" title="Biodiversity">Diversity</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Archaea" title="Archaea">Archaea</a></li> <li><a href="/wiki/Bacteria" title="Bacteria">Bacteria</a></li> <li><a href="/wiki/Eukaryote" title="Eukaryote">Eukaryote</a> <ul><li><a href="/wiki/Alga" class="mw-redirect" title="Alga">Alga</a></li> <li><a href="/wiki/Animal" title="Animal">Animal</a></li> <li><a href="/wiki/Fungus" title="Fungus">Fungus</a></li> <li><a href="/wiki/Plant" title="Plant">Plant</a></li> <li><a href="/wiki/Protist" title="Protist">Protist</a></li></ul></li> <li><a href="/wiki/Virus" title="Virus">Virus</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Plant form <br /> and function</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Epidermis_(botany)" title="Epidermis (botany)">Epidermis (botany)</a></li> <li><a href="/wiki/Flower" title="Flower">Flower</a></li> <li><a href="/wiki/Ground_tissue" title="Ground tissue">Ground tissue</a></li> <li><a href="/wiki/Leaf" title="Leaf">Leaf</a></li> <li><a href="/wiki/Phloem" title="Phloem">Phloem</a></li> <li><a href="/wiki/Plant_stem" title="Plant stem">Plant stem</a></li> <li><a href="/wiki/Root" title="Root">Root</a></li> <li><a href="/wiki/Shoot_(botany)" title="Shoot (botany)">Shoot</a></li> <li><a href="/wiki/Vascular_plant" title="Vascular plant">Vascular plant</a></li> <li><a href="/wiki/Vascular_tissue" title="Vascular tissue">Vascular tissue</a></li> <li><a href="/wiki/Xylem" title="Xylem">Xylem</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Animal form <br />and function</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Breathing" title="Breathing">Breathing</a></li> <li><a href="/wiki/Circulatory_system" title="Circulatory system">Circulatory system</a></li> <li><a href="/wiki/Endocrine_system" title="Endocrine system">Endocrine system</a></li> <li><a href="/wiki/Human_digestive_system" title="Human digestive system">Digestive system</a></li> <li><a href="/wiki/Homeostasis" title="Homeostasis">Homeostasis</a></li> <li><a href="/wiki/Immune_system" title="Immune system">Immune system</a></li> <li><a href="/wiki/Internal_environment" title="Internal environment">Internal environment</a></li> <li><a href="/wiki/Muscular_system" title="Muscular system">Muscular system</a></li> <li><a href="/wiki/Nervous_system" title="Nervous system">Nervous system</a></li> <li><a href="/wiki/Reproductive_system" title="Reproductive system">Reproductive system</a></li> <li><a href="/wiki/Respiratory_system" title="Respiratory system">Respiratory system</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Ecology" title="Ecology">Ecology</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Biogeochemical_cycle" title="Biogeochemical cycle">Biogeochemical cycle</a></li> <li><a href="/wiki/Biological_interaction" title="Biological interaction">Biological interaction</a></li> <li><a href="/wiki/Biomass" title="Biomass">Biomass</a></li> <li><a href="/wiki/Biome" title="Biome">Biomes</a></li> <li><a href="/wiki/Biosphere" title="Biosphere">Biosphere</a></li> <li><a href="/wiki/Climate" title="Climate">Climate</a></li> <li><a href="/wiki/Climate_change" title="Climate change">Climate change</a></li> <li><a href="/wiki/Community_(ecology)" title="Community (ecology)">Community</a></li> <li><a href="/wiki/Conservation_biology" title="Conservation biology">Conservation</a></li> <li><a href="/wiki/Ecosystem_ecology" title="Ecosystem ecology">Ecosystem</a></li> <li><a href="/wiki/Habitat" title="Habitat">Habitat</a> <ul><li><a href="/wiki/Ecological_niche" title="Ecological niche">niche</a></li></ul></li> <li><a href="/wiki/Microbiome" title="Microbiome">Microbiome</a></li> <li><a href="/wiki/Population_ecology" title="Population ecology">Population dynamics</a></li> <li><a href="/wiki/Resource_(biology)" title="Resource (biology)">Resources</a></li></ul> </div></td></tr></tbody></table><div></div></td><td class="noviewer navbox-image" rowspan="4" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:Tree_of_life_by_Haeckel.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Tree_of_life_by_Haeckel.jpg/140px-Tree_of_life_by_Haeckel.jpg" decoding="async" width="140" height="222" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Tree_of_life_by_Haeckel.jpg/210px-Tree_of_life_by_Haeckel.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/de/Tree_of_life_by_Haeckel.jpg/280px-Tree_of_life_by_Haeckel.jpg 2x" data-file-width="1804" data-file-height="2856" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_research_methods_in_biology" title="List of research methods in biology">Research <br /> methods</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Laboratory <br /> techniques</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Genetic_engineering" title="Genetic engineering">Genetic engineering</a></li> <li><a href="/wiki/Transformation_(genetics)" class="mw-redirect" title="Transformation (genetics)">Transformation</a></li> <li><a href="/wiki/Gel_electrophoresis" title="Gel electrophoresis">Gel electrophoresis</a></li> <li><a href="/wiki/Chromatography" title="Chromatography">Chromatography</a></li> <li><a href="/wiki/Centrifugation" title="Centrifugation">Centrifugation</a></li> <li><a href="/wiki/Cell_culture" title="Cell culture">Cell culture</a></li> <li><a href="/wiki/DNA_sequencing" title="DNA sequencing">DNA sequencing</a></li> <li><a href="/wiki/DNA_microarray" title="DNA microarray">DNA microarray</a></li> <li><a href="/wiki/Green_fluorescent_protein" title="Green fluorescent protein">Green fluorescent protein</a></li> <li><a href="/wiki/Vector_(molecular_biology)" title="Vector (molecular biology)">vector</a></li> <li><a href="/wiki/Enzyme_assay" title="Enzyme assay">Enzyme assay</a></li> <li><a href="/wiki/Protein_purification" title="Protein purification">Protein purification</a></li> <li><a href="/wiki/Western_blot" title="Western blot">Western blot</a></li> <li><a href="/wiki/Northern_blot" title="Northern blot">Northern blot</a></li> <li><a href="/wiki/Southern_blot" title="Southern blot">Southern blot</a></li> <li><a href="/wiki/Restriction_enzyme" title="Restriction enzyme">Restriction enzyme</a></li> <li><a href="/wiki/Polymerase_chain_reaction" title="Polymerase chain reaction">Polymerase chain reaction</a></li> <li><a href="/wiki/Two-hybrid_screening" title="Two-hybrid screening">Two-hybrid screening</a></li> <li><i><a href="/wiki/In_vivo" title="In vivo">in vivo</a></i></li> <li><i><a href="/wiki/In_vitro" title="In vitro">in vitro</a></i></li> <li><i><a href="/wiki/In_silico" title="In silico">in silico</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Field techniques</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Belt_transect" title="Belt transect">Belt transect</a></li> <li><a href="/wiki/Mark_and_recapture" title="Mark and recapture">mark and recapture</a></li> <li><a href="/wiki/Species_discovery_curve" title="Species discovery curve">species discovery curve</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Branches</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="excerpt-block"><div class="excerpt"> <ul><li><a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a></li> <li><a href="/wiki/Aerobiology" title="Aerobiology">Aerobiology</a></li> <li><a href="/wiki/Agronomy" title="Agronomy">Agronomy</a></li> <li><a href="/wiki/Agrostology" title="Agrostology">Agrostology</a></li> <li><a href="/wiki/Anatomy" title="Anatomy">Anatomy</a></li> <li><a href="/wiki/Astrobiology" title="Astrobiology">Astrobiology</a></li> <li><a href="/wiki/Bacteriology" title="Bacteriology">Bacteriology</a></li> <li><a href="/wiki/Biochemistry" title="Biochemistry">Biochemistry</a></li> <li><a href="/wiki/Biogeography" title="Biogeography">Biogeography</a></li> <li><a href="/wiki/Biogeology" title="Biogeology">Biogeology</a></li> <li><a href="/wiki/Bioinformatics" title="Bioinformatics">Bioinformatics</a></li> <li><a href="/wiki/Biological_engineering" title="Biological engineering">Biological engineering</a></li> <li><a href="/wiki/Biomechanics" title="Biomechanics">Biomechanics</a></li> <li><a href="/wiki/Biophysics" title="Biophysics">Biophysics</a></li> <li><a href="/wiki/Biosemiotics" title="Biosemiotics">Biosemiotics</a></li> <li><a href="/wiki/Biostatistics" title="Biostatistics">Biostatistics</a></li> <li><a href="/wiki/Biotechnology" title="Biotechnology">Biotechnology</a></li> <li><a href="/wiki/Botany" title="Botany">Botany</a></li> <li><a href="/wiki/Cell_biology" title="Cell biology">Cell biology</a></li> <li><a href="/wiki/Cellular_microbiology" title="Cellular microbiology">Cellular microbiology</a></li> <li><a href="/wiki/Chemical_biology" title="Chemical biology">Chemical biology</a></li> <li><a href="/wiki/Chronobiology" title="Chronobiology">Chronobiology</a></li> <li><a href="/wiki/Cognitive_biology" title="Cognitive biology">Cognitive biology</a></li> <li><a href="/wiki/Computational_biology" title="Computational biology">Computational biology</a></li> <li><a href="/wiki/Conservation_biology" title="Conservation biology">Conservation biology</a></li> <li><a href="/wiki/Cryobiology" title="Cryobiology">Cryobiology</a></li> <li><a href="/wiki/Cytogenetics" title="Cytogenetics">Cytogenetics</a></li> <li><a href="/wiki/Dendrology" title="Dendrology">Dendrology</a></li> <li><a href="/wiki/Developmental_biology" title="Developmental biology">Developmental biology</a></li> <li><a href="/wiki/Ecological_genetics" title="Ecological genetics">Ecological genetics</a></li> <li><a href="/wiki/Ecology" title="Ecology">Ecology</a></li> <li><a href="/wiki/Embryology" title="Embryology">Embryology</a></li> <li><a href="/wiki/Epidemiology" title="Epidemiology">Epidemiology</a></li> <li><a href="/wiki/Epigenetics" title="Epigenetics">Epigenetics</a></li> <li><a href="/wiki/Evolutionary_biology" title="Evolutionary biology">Evolutionary biology</a></li> <li><a href="/wiki/Freshwater_biology" title="Freshwater biology">Freshwater biology</a></li> <li><a href="/wiki/Generative_biology" class="mw-redirect" title="Generative biology">Generative biology</a></li> <li><a href="/wiki/Genetics" title="Genetics">Genetics</a></li> <li><a href="/wiki/Genomics" title="Genomics">Genomics</a></li> <li><a href="/wiki/Geobiology" title="Geobiology">Geobiology</a></li> <li><a href="/wiki/Gerontology" title="Gerontology">Gerontology</a></li> <li><a href="/wiki/Herpetology" title="Herpetology">Herpetology</a></li> <li><a href="/wiki/Histology" title="Histology">Histology</a></li> <li><a href="/wiki/Human_biology" title="Human biology">Human biology</a></li> <li><a href="/wiki/Ichthyology" title="Ichthyology">Ichthyology</a></li> <li><a href="/wiki/Immunology" title="Immunology">Immunology</a></li> <li><a href="/wiki/Lipidology" title="Lipidology">Lipidology</a></li> <li><a href="/wiki/Mammalogy" title="Mammalogy">Mammalogy</a></li> <li><a href="/wiki/Marine_biology" title="Marine biology">Marine biology</a></li> <li><a href="/wiki/Mathematical_and_theoretical_biology" title="Mathematical and theoretical biology">Mathematical biology</a></li> <li><a href="/wiki/Microbiology" title="Microbiology">Microbiology</a></li> <li><a href="/wiki/Molecular_biology" title="Molecular biology">Molecular biology</a></li> <li><a href="/wiki/Mycology" title="Mycology">Mycology</a></li> <li><a href="/wiki/Neontology" title="Neontology">Neontology</a></li> <li><a href="/wiki/Neuroscience" title="Neuroscience">Neuroscience</a></li> <li><a href="/wiki/Nutritional_science" title="Nutritional science">Nutrition</a></li> <li><a href="/wiki/Ornithology" title="Ornithology">Ornithology</a></li> <li><a href="/wiki/Osteology" title="Osteology">Osteology</a></li> <li><a href="/wiki/Paleontology" title="Paleontology">Paleontology</a></li> <li><a href="/wiki/Parasitology" title="Parasitology">Parasitology</a></li> <li><a href="/wiki/Pathology" title="Pathology">Pathology</a></li> <li><a href="/wiki/Pharmacology" title="Pharmacology">Pharmacology</a></li> <li><a href="/wiki/Photobiology" title="Photobiology">Photobiology</a></li> <li><a href="/wiki/Phycology" title="Phycology">Phycology</a></li> <li><a href="/wiki/Phylogenetics" title="Phylogenetics">Phylogenetics</a></li> <li><a href="/wiki/Physiology" title="Physiology">Physiology</a></li> <li><a href="/wiki/Pomology" title="Pomology">Pomology</a></li> <li><a href="/wiki/Primatology" title="Primatology">Primatology</a></li> <li><a href="/wiki/Proteomics" title="Proteomics">Proteomics</a></li> <li><a href="/wiki/Protistology" title="Protistology">Protistology</a></li> <li><a href="/wiki/Quantum_biology" title="Quantum biology">Quantum biology</a></li> <li><a href="/wiki/Relational_biology" class="mw-redirect" title="Relational biology">Relational biology</a></li> <li><a href="/wiki/Reproductive_biology" title="Reproductive biology">Reproductive biology</a></li> <li><a href="/wiki/Sociobiology" title="Sociobiology">Sociobiology</a></li> <li><a href="/wiki/Structural_biology" title="Structural biology">Structural biology</a></li> <li><a href="/wiki/Synthetic_biology" title="Synthetic biology">Synthetic biology</a></li> <li><a href="/wiki/Systematics" title="Systematics">Systematics</a></li> <li><a href="/wiki/Systems_biology" title="Systems biology">Systems biology</a></li> <li><a href="/wiki/Taxonomy_(biology)" title="Taxonomy (biology)">Taxonomy</a></li> <li><a href="/wiki/Teratology" title="Teratology">Teratology</a></li> <li><a href="/wiki/Toxicology" title="Toxicology">Toxicology</a></li> <li><a href="/wiki/Virology" title="Virology">Virology</a></li> <li><a href="/wiki/Virophysics" title="Virophysics">Virophysics</a></li> <li><a href="/wiki/Xenobiology" title="Xenobiology">Xenobiology</a></li> <li><a href="/wiki/Zoology" title="Zoology">Zoology</a></li></ul></div></div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Glossaries</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Glossary_of_biology" title="Glossary of biology">Biology</a></li> <li><a href="/wiki/Glossary_of_botanical_terms" title="Glossary of botanical terms">Botanical terms</a></li> <li><a href="/wiki/Glossary_of_ecology" title="Glossary of ecology">Ecological terms</a></li> <li><a href="/wiki/Glossary_of_plant_morphology" title="Glossary of plant morphology">Plant morphology terms</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><span class="nowrap"><span class="nowrap"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Issoria_lathonia.jpg" class="mw-file-description"><img alt="icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Issoria_lathonia.jpg/16px-Issoria_lathonia.jpg" decoding="async" width="16" height="11" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Issoria_lathonia.jpg/24px-Issoria_lathonia.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Issoria_lathonia.jpg/32px-Issoria_lathonia.jpg 2x" data-file-width="629" data-file-height="445" /></a></span> </span><a href="/wiki/Portal:Biology" title="Portal:Biology">Biology portal</a></span></li> <li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Biology" title="Category:Biology">Category</a></li> <li><span class="noviewer" typeof="mw:File"><span title="Commons page"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span> <a href="https://commons.wikimedia.org/wiki/Category:Biology" class="extiw" title="commons:Category:Biology">Commons</a></li> <li><span class="noviewer" typeof="mw:File"><span title="WikiProject"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/37/People_icon.svg/16px-People_icon.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/37/People_icon.svg/24px-People_icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/37/People_icon.svg/32px-People_icon.svg.png 2x" data-file-width="100" data-file-height="100" /></span></span> <a href="/wiki/Wikipedia:WikiProject_Biology" title="Wikipedia:WikiProject Biology">WikiProject</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Origin_of_life" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="text-align:center;"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Origin_of_life" title="Template:Origin of life"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Origin_of_life" title="Template talk:Origin of life"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Origin_of_life" title="Special:EditPage/Template:Origin of life"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Origin_of_life" style="font-size:114%;margin:0 4em"><a href="/wiki/Abiogenesis" title="Abiogenesis">Origin of life</a></div></th></tr><tr><th scope="row" class="navbox-group" style="text-align:center;;width:1%"><a href="/wiki/History_of_research_into_the_origin_of_life" title="History of research into the origin of life">History of research</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Panspermia" title="Panspermia">Panspermia</a> (5th century BC)</li> <li><a href="/wiki/Spontaneous_generation" title="Spontaneous generation">Spontaneous generation</a> (4th century BC)</li> <li><a href="/wiki/Primordial_soup" title="Primordial soup">Primordial soup</a> (19th century)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align:center;;width:1%">Prebiotic synthesis</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pseudo-panspermia" title="Pseudo-panspermia">Pseudo-panspermia</a></li> <li><a href="/wiki/Miller%E2%80%93Urey_experiment" title="Miller–Urey experiment">Miller–Urey experiment</a></li> <li><a href="/wiki/Formamide-based_prebiotic_chemistry" title="Formamide-based prebiotic chemistry">Formamide-based prebiotic chemistry</a></li> <li><a href="/wiki/Alternative_abiogenesis_scenarios" title="Alternative abiogenesis scenarios">Alternative abiogenesis scenarios</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align:center;;width:1%"><a href="/wiki/Protocell" title="Protocell">Protocells</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/GADV-protein_world_hypothesis" title="GADV-protein world hypothesis">GADV-protein world</a></li> <li><a href="/wiki/Graham_Cairns-Smith#Clay_hypothesis" title="Graham Cairns-Smith">Clay hypothesis</a></li> <li><a href="/wiki/Iron%E2%80%93sulfur_world_hypothesis" title="Iron–sulfur world hypothesis">Iron–sulfur world</a> <ul><li><a href="/wiki/Primordial_sandwich" title="Primordial sandwich">Primordial sandwich</a></li></ul></li> <li><a href="/wiki/PAH_world" class="mw-redirect" title="PAH world">PAH world</a></li> <li><a href="/wiki/Peptide-RNA_world" class="mw-redirect" title="Peptide-RNA world">Peptide-RNA world</a></li> <li><a href="/wiki/Quasispecies_model" title="Quasispecies model">Quasispecies model</a></li> <li><a href="/wiki/RNA_world" title="RNA world">RNA world</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align:center;;width:1%">Earliest organisms</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Earliest known life forms</a></li> <li><a href="/wiki/Last_universal_common_ancestor" title="Last universal common ancestor">Last universal common ancestor</a> (LUCA)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align:center;;width:1%">Research</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astrobiology" title="Astrobiology">Astrobiology</a></li> <li><a href="/wiki/Paleobiology" title="Paleobiology">Paleobiology</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Astrobiology" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="text-align: center;"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Astrobiology" title="Template:Astrobiology"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Astrobiology" title="Template talk:Astrobiology"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Astrobiology" title="Special:EditPage/Template:Astrobiology"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Astrobiology" style="font-size:114%;margin:0 4em"><a href="/wiki/Astrobiology" title="Astrobiology">Astrobiology</a></div></th></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Disciplines</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astrochemistry" title="Astrochemistry">Astrochemistry</a></li> <li><a href="/wiki/Astrophysics" title="Astrophysics">Astrophysics</a></li> <li><a href="/wiki/Atmospheric_sciences" class="mw-redirect" title="Atmospheric sciences">Atmospheric sciences</a></li> <li><a href="/wiki/Biochemistry" title="Biochemistry">Biochemistry</a></li> <li><a href="/wiki/Evolutionary_biology" title="Evolutionary biology">Evolutionary biology</a></li> <li><a href="/wiki/Exoplanetology" class="mw-redirect" title="Exoplanetology">Exoplanetology</a></li> <li><a href="/wiki/Geomicrobiology" title="Geomicrobiology">Geomicrobiology</a></li> <li><a href="/wiki/Microbiology" title="Microbiology">Microbiology</a></li> <li><a href="/wiki/Paleontology" title="Paleontology">Paleontology</a></li> <li><a href="/wiki/Planetary_oceanography" title="Planetary oceanography">Planetary oceanography</a></li> <li><a href="/wiki/Planetary_science" title="Planetary science">Planetary science</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Main topics</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a></li> <li><a href="/wiki/Allan_Hills_84001" title="Allan Hills 84001">Allan Hills 84001</a></li> <li><a href="/wiki/Biomolecule" title="Biomolecule">Biomolecule</a></li> <li><a href="/wiki/Biosignature" title="Biosignature">Biosignature</a></li> <li><a href="/wiki/Drake_equation" title="Drake equation">Drake equation</a></li> <li><a class="mw-selflink selflink">Earliest known life forms</a></li> <li><a href="/wiki/Earth_analog" title="Earth analog">Earth analog</a></li> <li><a href="/wiki/Extraterrestrial_life" title="Extraterrestrial life">Extraterrestrial life</a></li> <li><a href="/wiki/Extraterrestrial_sample_curation" title="Extraterrestrial sample curation">Extraterrestrial sample curation</a></li> <li><a href="/wiki/Extremophile" title="Extremophile">Extremophiles</a></li> <li><a href="/wiki/Hypothetical_types_of_biochemistry" title="Hypothetical types of biochemistry">Hypothetical types of biochemistry</a></li> <li><a href="/wiki/List_of_microorganisms_tested_in_outer_space" title="List of microorganisms tested in outer space">List of microorganisms tested in outer space</a></li> <li><a href="/wiki/Ocean_planet" class="mw-redirect" title="Ocean planet">Ocean planet</a></li> <li><a href="/wiki/Panspermia" title="Panspermia">Panspermia</a></li> <li><a href="/wiki/Planetary_protection" title="Planetary protection">Planetary protection</a></li> <li><a href="/wiki/Search_for_extraterrestrial_intelligence" title="Search for extraterrestrial intelligence">Search for extraterrestrial intelligence (SETI)</a></li> <li><a href="/wiki/Yamato_000593" title="Yamato 000593">Yamato meteorite</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Planetary_habitability" title="Planetary habitability">Planetary<br />habitability</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Circumstellar_habitable_zone" class="mw-redirect" title="Circumstellar habitable zone">Circumstellar habitable zone</a></li> <li><a href="/wiki/Earth_analog" title="Earth analog">Earth analog</a></li> <li><a href="/wiki/Extraterrestrial_liquid_water" title="Extraterrestrial liquid water">Extraterrestrial liquid water</a></li> <li><a href="/wiki/Galactic_habitable_zone" title="Galactic habitable zone">Galactic habitable zone</a></li> <li><a href="/wiki/Habitability_of_binary_star_systems" title="Habitability of binary star systems">Habitability of binary star systems</a></li> <li><a href="/wiki/Habitability_of_natural_satellites" title="Habitability of natural satellites">Habitability of natural satellites</a></li> <li><a href="/wiki/Habitability_of_neutron_star_systems" title="Habitability of neutron star systems">Habitability of neutron star systems</a></li> <li><a href="/wiki/Habitability_of_red_dwarf_systems" title="Habitability of red dwarf systems">Habitability of red dwarf systems</a></li> <li><a href="/wiki/Habitability_of_K-type_main-sequence_star_systems" title="Habitability of K-type main-sequence star systems">Habitability of K-type main-sequence star systems</a></li> <li><a href="/wiki/Habitability_of_yellow_dwarf_systems" title="Habitability of yellow dwarf systems">Habitability of yellow dwarf systems</a></li> <li><a href="/wiki/Habitability_of_F-type_main-sequence_star_systems" title="Habitability of F-type main-sequence star systems">Habitability of F-type main-sequence star systems</a></li> <li><a href="/wiki/Habitable_zone_for_complex_life" title="Habitable zone for complex life">Habitable zone for complex life</a></li> <li><a href="/wiki/List_of_potentially_habitable_exoplanets" title="List of potentially habitable exoplanets">List of potentially habitable exoplanets</a></li> <li><a href="/wiki/Tholin" title="Tholin">Tholin</a></li> <li><a href="/wiki/Superhabitable_planet" class="mw-redirect" title="Superhabitable planet">Superhabitable planet</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Space<br /> missions</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Earth orbit</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Space_Flyer_Unit#Experimentation_data" title="Space Flyer Unit">BIO</a></li> <li><a href="/wiki/Apollo_17#Biological_cosmic_ray_experiment" title="Apollo 17">BIOCORE</a></li> <li><a href="/wiki/Biolab" title="Biolab">Biolab</a></li> <li><a href="/wiki/Bion_(satellite)" title="Bion (satellite)">Bion</a></li> <li><a href="/wiki/BIOPAN" title="BIOPAN">BIOPAN</a></li> <li><a href="/wiki/Biosatellite_program" title="Biosatellite program">Biosatellite program</a></li> <li><a href="/wiki/Exposing_Microorganisms_in_the_Stratosphere" title="Exposing Microorganisms in the Stratosphere">E-MIST</a></li> <li><a href="/wiki/Exobiology_Radiation_Assembly" title="Exobiology Radiation Assembly">ERA</a></li> <li><a href="/wiki/EuCROPIS" title="EuCROPIS">Eu:CROPIS</a></li> <li><a href="/wiki/Long_Duration_Exposure_Facility#EXOSTACK" title="Long Duration Exposure Facility">EXOSTACK</a></li> <li><a href="/wiki/EXPOSE" title="EXPOSE">EXPOSE</a></li> <li><a href="/wiki/Chang%27e_4#Lunar_lander" title="Chang'e 4">Lunar Micro Ecosystem</a></li> <li><a href="/wiki/O/OREOS" title="O/OREOS">O/OREOS</a></li> <li><a href="/wiki/OREOcube" title="OREOcube">OREOcube</a></li> <li><a href="/wiki/Tanpopo_(mission)" class="mw-redirect" title="Tanpopo (mission)">Tanpopo</a></li> <li><a href="/wiki/Vegetable_Production_System" title="Vegetable Production System">VEGGIE</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Mars</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Beagle_2" title="Beagle 2">Beagle 2</a></li> <li><a href="/wiki/Fobos-Grunt" title="Fobos-Grunt">Fobos-Grunt</a></li> <li><a href="/wiki/Mars_Science_Laboratory" title="Mars Science Laboratory">Mars Science Laboratory</a> <ul><li><a href="/wiki/Curiosity_(rover)" title="Curiosity (rover)"><i>Curiosity</i> rover</a></li></ul></li> <li><a href="/wiki/Mars_2020" title="Mars 2020">Mars 2020</a> <ul><li><a href="/wiki/Perseverance_(rover)" title="Perseverance (rover)"><i>Perseverance</i> rover</a></li></ul></li> <li><i><a href="/wiki/Phoenix_(spacecraft)" title="Phoenix (spacecraft)">Phoenix</a></i></li> <li><a href="/wiki/Tianwen-1" title="Tianwen-1">Tianwen-1</a> <ul><li><a href="/wiki/Zhurong_(rover)" title="Zhurong (rover)"><i>Zhurong</i> rover</a></li></ul></li> <li><a href="/wiki/Trace_Gas_Orbiter" title="Trace Gas Orbiter">Trace Gas Orbiter</a></li> <li><a href="/wiki/Viking_lander_biological_experiments" title="Viking lander biological experiments">Viking</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Comets and<br />asteroids</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Hayabusa2" title="Hayabusa2">Hayabusa2</a></i></li> <li><a href="/wiki/OSIRIS-REx" title="OSIRIS-REx">OSIRIS-REx</a></li> <li><i><a href="/wiki/Rosetta_(spacecraft)" title="Rosetta (spacecraft)">Rosetta</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Heliocentric</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/BioSentinel" title="BioSentinel">BioSentinel</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Planned</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Dragonfly_(Titan_space_probe)" title="Dragonfly (Titan space probe)">Dragonfly</a></i></li> <li><a href="/wiki/Europa_Clipper" title="Europa Clipper">Europa Clipper</a></li> <li><a href="/wiki/ExoMars" title="ExoMars">ExoMars</a> <ul><li><a href="/wiki/Rosalind_Franklin_(rover)" title="Rosalind Franklin (rover)"><i>Rosalind Franklin</i> rover</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Proposed</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Breakthrough_Enceladus_mission" title="Breakthrough Enceladus mission">Breakthrough Enceladus</a></li> <li><a href="/wiki/BRUIE" title="BRUIE">BRUIE</a></li> <li><a href="/wiki/CAESAR_(spacecraft)" title="CAESAR (spacecraft)">CAESAR</a></li> <li><a href="/wiki/Enceladus_Explorer" title="Enceladus Explorer">Enceladus Explorer</a></li> <li><a href="/wiki/Enceladus_Life_Finder" title="Enceladus Life Finder">Enceladus Life Finder‎</a></li> <li><a href="/wiki/Enceladus_Life_Signatures_and_Habitability" title="Enceladus Life Signatures and Habitability">Enceladus Life Signatures and Habitability</a></li> <li><a href="/wiki/Enceladus_Orbilander" title="Enceladus Orbilander">Enceladus Orbilander</a></li> <li><a href="/wiki/Europa_Lander_(NASA)" class="mw-redirect" title="Europa Lander (NASA)">Europa Lander</a></li> <li><a href="/wiki/ExoLance" title="ExoLance">ExoLance</a></li> <li><a href="/wiki/Explorer_of_Enceladus_and_Titan" title="Explorer of Enceladus and Titan">Explorer of Enceladus and Titan</a></li> <li><a href="/wiki/Icebreaker_Life" title="Icebreaker Life">Icebreaker Life</a></li> <li><a href="/wiki/Journey_to_Enceladus_and_Titan" title="Journey to Enceladus and Titan">Journey to Enceladus and Titan</a></li> <li><a href="/wiki/Laplace-P" title="Laplace-P">Laplace-P</a></li> <li><a href="/wiki/Life_Investigation_For_Enceladus" title="Life Investigation For Enceladus">Life Investigation For Enceladus</a></li> <li><a href="/wiki/Mars_sample_return_mission" class="mw-redirect" title="Mars sample return mission">Mars sample return mission</a></li> <li><a href="/wiki/Oceanus_(Titan_orbiter)" title="Oceanus (Titan orbiter)">Oceanus</a></li> <li><a href="/wiki/THEO" title="THEO">THEO</a></li> <li><a href="/wiki/Trident_(spacecraft)" title="Trident (spacecraft)">Trident</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Cancelled and <br />undeveloped</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astrobiology_Field_Laboratory" title="Astrobiology Field Laboratory">Astrobiology Field Laboratory</a></li> <li><a href="/wiki/Beagle_3" title="Beagle 3">Beagle 3</a></li> <li><a href="/wiki/Biological_Oxidant_and_Life_Detection" title="Biological Oxidant and Life Detection">Biological Oxidant and Life Detection</a></li> <li><a href="/wiki/Kazachok" title="Kazachok">Kazachok</a></li> <li><a href="/wiki/Living_Interplanetary_Flight_Experiment" title="Living Interplanetary Flight Experiment">Living Interplanetary Flight Experiment</a></li> <li><a href="/wiki/Mars_Astrobiology_Explorer-Cacher" title="Mars Astrobiology Explorer-Cacher">Mars Astrobiology Explorer-Cacher</a></li> <li><a href="/wiki/MELOS" title="MELOS">MELOS</a></li> <li><a href="/wiki/Northern_Light_(spacecraft)" title="Northern Light (spacecraft)">Northern Light</a></li> <li><a href="/wiki/SpaceX_Red_Dragon" title="SpaceX Red Dragon">Red Dragon</a></li> <li><a href="/wiki/Terrestrial_Planet_Finder" title="Terrestrial Planet Finder">Terrestrial Planet Finder</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Institutions<br />and programs</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astrobiology_Society_of_Britain" title="Astrobiology Society of Britain">Astrobiology Society of Britain</a></li> <li><a href="/wiki/Astrobiology_Science_and_Technology_for_Exploring_Planets" title="Astrobiology Science and Technology for Exploring Planets">Astrobiology Science and Technology for Exploring Planets</a></li> <li><a href="/wiki/Breakthrough_Initiatives" title="Breakthrough Initiatives">Breakthrough Initiatives</a> <ul><li><a href="/wiki/Breakthrough_Listen" title="Breakthrough Listen">Breakthrough Listen</a></li> <li><a href="/wiki/Breakthrough_Message" class="mw-redirect" title="Breakthrough Message">Breakthrough Message</a></li> <li><a href="/wiki/Breakthrough_Starshot" title="Breakthrough Starshot">Breakthrough Starshot</a></li></ul></li> <li><a href="/wiki/Carl_Sagan_Institute" title="Carl Sagan Institute">Carl Sagan Institute</a></li> <li><a href="/wiki/Center_for_Life_Detection_Science" class="mw-redirect" title="Center for Life Detection Science">Center for Life Detection Science</a></li> <li><a href="/wiki/European_Astrobiology_Network_Association" title="European Astrobiology Network Association">European Astrobiology Network Association</a></li> <li><a href="/wiki/MERMOZ" title="MERMOZ">MERMOZ</a></li> <li><a href="/wiki/NASA_Astrobiology_Institute" title="NASA Astrobiology Institute">NASA Astrobiology Institute</a></li> <li><a href="/wiki/Nexus_for_Exoplanet_System_Science" title="Nexus for Exoplanet System Science">Nexus for Exoplanet System Science</a></li> <li><a href="/wiki/Ocean_Worlds_Exploration_Program" title="Ocean Worlds Exploration Program">Ocean Worlds Exploration Program</a></li> <li><a href="/wiki/Spanish_Astrobiology_Center" title="Spanish Astrobiology Center">Spanish Astrobiology Center‎</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align: center;"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <b><a href="/wiki/Category:Astrobiology" title="Category:Astrobiology">Category</a></b></li> <li><span class="noviewer" typeof="mw:File"><span title="Commons page"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span> <b><a href="https://commons.wikimedia.org/wiki/Category:Astrobiology" class="extiw" title="commons:Category:Astrobiology">Commons</a></b></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Extraterrestrial_life" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="text-align: center;"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Extraterrestrial_life" title="Template:Extraterrestrial life"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Extraterrestrial_life" title="Template talk:Extraterrestrial life"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Extraterrestrial_life" title="Special:EditPage/Template:Extraterrestrial life"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Extraterrestrial_life" style="font-size:114%;margin:0 4em"><a href="/wiki/Extraterrestrial_life" title="Extraterrestrial life">Extraterrestrial life</a></div></th></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Events and objects</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Shergotty_meteorite" title="Shergotty meteorite">Shergotty meteorite</a> (1865)</li> <li><a href="/wiki/Nakhla_meteorite" title="Nakhla meteorite">Nakhla meteorite</a> (1911)</li> <li><a href="/wiki/Murchison_meteorite" title="Murchison meteorite">Murchison meteorite</a> (1969)</li> <li><a href="/wiki/Viking_lander_biological_experiments" title="Viking lander biological experiments">Viking lander biological experiments</a> (1976)</li> <li><a href="/wiki/Allan_Hills_77005" title="Allan Hills 77005">Allan Hills 77005</a> (1977)</li> <li><a href="/wiki/Allan_Hills_84001" title="Allan Hills 84001">Allan Hills 84001</a> (1984)</li> <li><a href="/wiki/Yamato_000593" title="Yamato 000593">Yamato 000593</a> (2000)</li> <li><a href="/wiki/CI1_fossils" title="CI1 fossils">CI1 fossils</a> (2011)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Signals of interest</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Misidentified</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/PSR_B1919%2B21" title="PSR B1919+21">CP 1919</a> <span style="font-size:85%;">(misidentified pulsar)</span></li> <li><a href="/wiki/CTA-102" title="CTA-102">CTA-102</a> <span style="font-size:85%;">(misidentified quasar)</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Stars</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Tabby%27s_Star" title="Tabby's Star">KIC 8462852</a> <span style="font-size:85%;">(unusual light fluctuations)</span></li> <li><a href="/wiki/EPIC_204278916" title="EPIC 204278916">EPIC 204278916</a> <span style="font-size:85%;">(unusual light fluctuations)</span></li> <li><a href="/wiki/VVV-WIT-07" title="VVV-WIT-07">VVV-WIT-07</a> <span style="font-size:85%;">(unusual light fluctuations)</span></li> <li><a href="/wiki/HD_164595" title="HD 164595">HD 164595 signal</a> <span style="font-size:85%;">(unknown origin)</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: center;">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/SHGb02%2B14a" title="SHGb02+14a">SHGb02+14a</a> <span style="font-size:85%;">(radio source)</span></li> <li><a href="/wiki/Wow!_signal" title="Wow! signal">Wow! signal</a> <span style="font-size:85%;">(inconclusive)</span></li> <li><a href="/wiki/Fast_radio_burst" title="Fast radio burst">Fast radio burst</a> <span style="font-size:85%;">(unknown origin)</span></li> <li><a href="/wiki/BLC1" title="BLC1">BLC1</a> <span style="font-size:85%;">(radio signal)</span></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Life in the Universe</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Earliest known life forms</a></li> <li><a href="/wiki/Planetary_habitability_in_the_Solar_System" title="Planetary habitability in the Solar System">Planetary habitability in the Solar System</a></li> <li><a href="/wiki/Life_on_Venus" title="Life on Venus">Life on Venus</a></li> <li><a href="/wiki/Life_on_Mars" title="Life on Mars">Life on Mars</a></li> <li><a href="/wiki/Life_on_Titan" title="Life on Titan">Life on Titan</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Planetary_habitability" title="Planetary habitability">Planetary<br />habitability</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Catalog_of_Nearby_Habitable_Systems" title="Catalog of Nearby Habitable Systems">Catalog of Nearby Habitable Systems</a></li> <li><a href="/wiki/Circumstellar_habitable_zone" class="mw-redirect" title="Circumstellar habitable zone">Circumstellar habitable zone</a></li> <li><a href="/wiki/Earth_analog" title="Earth analog">Earth analog</a></li> <li><a href="/wiki/Extraterrestrial_liquid_water" title="Extraterrestrial liquid water">Extraterrestrial liquid water</a></li> <li><a href="/wiki/Galactic_habitable_zone" title="Galactic habitable zone">Galactic habitable zone</a></li> <li><a href="/wiki/Habitability_of_binary_star_systems" title="Habitability of binary star systems">Habitability of binary star systems</a></li> <li><a href="/wiki/Habitability_of_natural_satellites" title="Habitability of natural satellites">Habitability of natural satellites</a></li> <li><a href="/wiki/Habitability_of_neutron_star_systems" title="Habitability of neutron star systems">Habitability of neutron star systems</a></li> <li><a href="/wiki/Habitability_of_red_dwarf_systems" title="Habitability of red dwarf systems">Habitability of red dwarf systems</a></li> <li><a href="/wiki/Habitability_of_K-type_main-sequence_star_systems" title="Habitability of K-type main-sequence star systems">Habitability of K-type main-sequence star systems</a></li> <li><a href="/wiki/Habitability_of_yellow_dwarf_systems" title="Habitability of yellow dwarf systems">Habitability of yellow dwarf systems</a></li> <li><a href="/wiki/Habitability_of_F-type_main-sequence_star_systems" title="Habitability of F-type main-sequence star systems">Habitability of F-type main-sequence star systems</a></li> <li><a href="/wiki/List_of_potentially_habitable_exoplanets" title="List of potentially habitable exoplanets">List of potentially habitable exoplanets</a></li> <li><a href="/wiki/Planetary_habitability" title="Planetary habitability">Planetary habitability</a></li> <li><a href="/wiki/Superhabitable_planet" class="mw-redirect" title="Superhabitable planet">Superhabitable planet</a></li> <li><a href="/wiki/Tholin" title="Tholin">Tholin</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Astrobiology#Missions" title="Astrobiology">Space missions</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Beagle_2" title="Beagle 2">Beagle 2</a></li> <li><a href="/wiki/Biological_Oxidant_and_Life_Detection" title="Biological Oxidant and Life Detection">Biological Oxidant and Life Detection</a></li> <li><a href="/wiki/BioSentinel" title="BioSentinel">BioSentinel</a></li> <li><a href="/wiki/Curiosity_(rover)" title="Curiosity (rover)"><i>Curiosity</i> rover</a></li> <li><i><a href="/wiki/Darwin_(spacecraft)" title="Darwin (spacecraft)">Darwin</a></i></li> <li><i><a href="/wiki/Dragonfly_(Titan_space_probe)" title="Dragonfly (Titan space probe)">Dragonfly</a></i></li> <li><a href="/wiki/Enceladus_Explorer" title="Enceladus Explorer">Enceladus Explorer</a></li> <li><a href="/wiki/Enceladus_Life_Finder" title="Enceladus Life Finder">Enceladus Life Finder</a></li> <li><i><a href="/wiki/Europa_Clipper" title="Europa Clipper">Europa Clipper</a></i></li> <li><a href="/wiki/ExoMars" title="ExoMars">ExoMars</a> <ul><li><a href="/wiki/Rosalind_Franklin_(rover)" title="Rosalind Franklin (rover)"><i>Rosalind Franklin</i> rover</a></li></ul></li> <li><a href="/wiki/ExoLance" title="ExoLance">ExoLance</a></li> <li><a href="/wiki/EXPOSE" title="EXPOSE">EXPOSE</a></li> <li><a href="/wiki/Foton-M" class="mw-redirect" title="Foton-M">Foton-M3</a></li> <li><a href="/wiki/Icebreaker_Life" title="Icebreaker Life">Icebreaker Life</a></li> <li><a href="/wiki/Journey_to_Enceladus_and_Titan" title="Journey to Enceladus and Titan">Journey to Enceladus and Titan</a></li> <li><a href="/wiki/Laplace-P" title="Laplace-P">Laplace-P</a></li> <li><a href="/wiki/Life_Investigation_For_Enceladus" title="Life Investigation For Enceladus">Life Investigation For Enceladus</a></li> <li><a href="/wiki/Living_Interplanetary_Flight_Experiment" title="Living Interplanetary Flight Experiment">Living Interplanetary Flight Experiment</a></li> <li><a href="/wiki/Mars_Geyser_Hopper" title="Mars Geyser Hopper">Mars Geyser Hopper</a></li> <li><a href="/wiki/Mars_sample-return_mission" title="Mars sample-return mission">Mars sample-return mission</a></li> <li><a href="/wiki/Mars_2020" title="Mars 2020">Mars 2020</a></li> <li><a href="/wiki/Northern_Light_(spacecraft)" title="Northern Light (spacecraft)">Northern Light</a></li> <li><a href="/wiki/Opportunity_(rover)" title="Opportunity (rover)"><i>Opportunity</i> rover</a></li> <li><a href="/wiki/Perseverance_(rover)" title="Perseverance (rover)"><i>Perseverance</i> rover</a></li> <li><a href="/wiki/SpaceX_Red_Dragon" title="SpaceX Red Dragon">SpaceX Red Dragon</a></li> <li><a href="/wiki/Spirit_(rover)" title="Spirit (rover)"><i>Spirit</i> rover</a></li> <li><a href="/wiki/Tanpopo_mission" title="Tanpopo mission">Tanpopo</a></li> <li><a href="/wiki/Titan_Mare_Explorer" title="Titan Mare Explorer">Titan Mare Explorer</a></li> <li><a href="/wiki/Venus_In_Situ_Explorer" title="Venus In Situ Explorer">Venus In Situ Explorer</a></li> <li><i><a href="/wiki/Viking_1" title="Viking 1">Viking 1</a></i></li> <li><i><a href="/wiki/Viking_2" title="Viking 2">Viking 2</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Interstellar_communication" title="Interstellar communication">Interstellar<br />communication</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Active_SETI" title="Active SETI">Active SETI</a></li> <li><a href="/wiki/Allen_Telescope_Array" title="Allen Telescope Array">Allen Telescope Array</a></li> <li><a href="/wiki/Arecibo_message" title="Arecibo message">Arecibo message</a></li> <li><a href="/wiki/Arecibo_Observatory" title="Arecibo Observatory">Arecibo Observatory</a></li> <li><a href="/wiki/Berkeley_SETI_Research_Center" title="Berkeley SETI Research Center">Berkeley SETI Research Center</a></li> <li><a href="/wiki/Bracewell_probe" title="Bracewell probe">Bracewell probe</a></li> <li><a href="/wiki/Breakthrough_Initiatives" title="Breakthrough Initiatives">Breakthrough Initiatives</a> <ul><li><a href="/wiki/Breakthrough_Listen" title="Breakthrough Listen">Breakthrough Listen</a></li> <li><a href="/wiki/Breakthrough_Message" class="mw-redirect" title="Breakthrough Message">Breakthrough Message</a></li></ul></li> <li><a href="/wiki/Communication_with_extraterrestrial_intelligence" title="Communication with extraterrestrial intelligence">Communication with extraterrestrial intelligence</a></li> <li><a href="/wiki/Gauss%27s_Pythagorean_right_triangle_proposal" title="Gauss's Pythagorean right triangle proposal">Gauss's Pythagorean right triangle proposal</a></li> <li><a href="/wiki/Astrolinguistics" title="Astrolinguistics">Astrolinguistics</a></li> <li><a href="/wiki/Lincos_language" title="Lincos language">Lincos language</a></li> <li><a href="/wiki/NIROSETI" title="NIROSETI">NIROSETI</a></li> <li><a href="/wiki/Pioneer_plaque" title="Pioneer plaque">Pioneer plaque</a></li> <li><a href="/wiki/Project_Cyclops" title="Project Cyclops">Project Cyclops</a></li> <li><a href="/wiki/Project_Ozma" title="Project Ozma">Project Ozma</a></li> <li><a href="/wiki/Project_Phoenix_(SETI)" title="Project Phoenix (SETI)">Project Phoenix</a></li> <li><a href="/wiki/SERENDIP" title="SERENDIP">SERENDIP</a></li> <li><a href="/wiki/Search_for_extraterrestrial_intelligence" title="Search for extraterrestrial intelligence">Search for extraterrestrial intelligence</a></li> <li><a href="/wiki/SETI@home" title="SETI@home">SETI@home</a></li> <li><a href="/wiki/SetiQuest" title="SetiQuest">setiQuest</a></li> <li><a href="/wiki/Voyager_Golden_Record" title="Voyager Golden Record">Voyager Golden Record</a></li> <li><a href="/wiki/Water_hole_(radio)" title="Water hole (radio)">Water hole</a></li> <li><a href="/wiki/Alien_language" title="Alien language">Xenolinguistics</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/List_of_alleged_extraterrestrial_beings" title="List of alleged extraterrestrial beings">Types of alleged<br /> extraterrestrial beings</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Energy_being" title="Energy being">Energy beings</a></li> <li><a href="/wiki/Grey_alien" title="Grey alien">Grey aliens</a></li> <li><a href="/wiki/Insectoids_in_science_fiction" class="mw-redirect" title="Insectoids in science fiction">Insectoids</a></li> <li><a href="/wiki/Little_green_men" title="Little green men">Little green men</a></li> <li><a href="/wiki/Nordic_aliens" title="Nordic aliens">Nordic aliens</a></li> <li><a href="/wiki/Reptilian_humanoid" title="Reptilian humanoid">Reptilian humanoids</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%">Hypotheses</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cosmic_pluralism" title="Cosmic pluralism">Cosmic pluralism</a></li> <li><a href="/wiki/Directed_panspermia" title="Directed panspermia">Directed panspermia</a></li> <li><a href="/wiki/Drake_equation" title="Drake equation">Drake equation</a></li> <li><a href="/wiki/Extraterrestrial_hypothesis" class="mw-redirect" title="Extraterrestrial hypothesis">Extraterrestrial hypothesis</a></li> <li><a href="/wiki/Fermi_paradox" title="Fermi paradox">Fermi paradox</a></li> <li><a href="/wiki/Hypothetical_types_of_biochemistry" title="Hypothetical types of biochemistry">Hypothetical types of biochemistry</a></li> <li><a href="/wiki/Interplanetary_contamination" title="Interplanetary contamination">Interplanetary contamination</a></li> <li><a href="/wiki/Kardashev_scale" title="Kardashev scale">Kardashev scale</a></li> <li><a href="/wiki/Mediocrity_principle" title="Mediocrity principle">Mediocrity principle</a></li> <li><a href="/wiki/Panspermia" title="Panspermia">Panspermia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Fermi_paradox" title="Fermi paradox">Fermi paradox</a> solutions</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aestivation_hypothesis" title="Aestivation hypothesis">Aestivation hypothesis</a></li> <li><a href="/wiki/Berserker_hypothesis" title="Berserker hypothesis">Berserker hypothesis</a></li> <li><a href="/wiki/Dark_forest_hypothesis" title="Dark forest hypothesis">Dark forest hypothesis</a></li> <li><a href="/wiki/Firstborn_hypothesis" title="Firstborn hypothesis">Firstborn hypothesis</a></li> <li><a href="/wiki/Great_Filter" title="Great Filter">Great Filter</a></li> <li><a href="/wiki/Hart%E2%80%93Tipler_conjecture" title="Hart–Tipler conjecture">Hart–Tipler conjecture</a></li> <li><a href="/wiki/Neocatastrophism" title="Neocatastrophism">Neocatastrophism</a></li> <li><a href="/wiki/Planetarium_hypothesis" title="Planetarium hypothesis">Planetarium hypothesis</a></li> <li><a href="/wiki/Rare_Earth_hypothesis" title="Rare Earth hypothesis">Rare Earth hypothesis</a></li> <li><a href="/wiki/Zoo_hypothesis" title="Zoo hypothesis">Zoo hypothesis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:1%"><a href="/wiki/Outline_of_extraterrestrial_life" title="Outline of extraterrestrial life">Related topics</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ancient_astronauts" title="Ancient astronauts">Ancient astronauts</a></li> <li><a href="/wiki/Astrobiology" title="Astrobiology">Astrobiology</a></li> <li><a href="/wiki/Astroecology" title="Astroecology">Astroecology</a></li> <li><a href="/wiki/Biosignature" title="Biosignature">Biosignature</a></li> <li><a href="/wiki/Brookings_Report" title="Brookings Report">Brookings Report</a></li> <li><a href="/wiki/Exotheology" title="Exotheology">Exotheology</a></li> <li><a href="/wiki/Extraterrestrials_in_fiction" title="Extraterrestrials in fiction">Extraterrestrials in fiction</a></li> <li><a href="/wiki/Extremophile" title="Extremophile">Extremophile</a></li> <li><a href="/wiki/Hemolithin" title="Hemolithin">Hemolithin</a></li> <li><a href="/wiki/History_of_the_extraterrestrial_life_debate" title="History of the extraterrestrial life debate">History of the extraterrestrial life debate</a></li> <li><a href="/wiki/MERMOZ" title="MERMOZ">MERMOZ</a></li> <li><a href="/wiki/Nexus_for_Exoplanet_System_Science" title="Nexus for Exoplanet System Science">Nexus for Exoplanet System Science</a></li> <li><a href="/wiki/Noosphere" title="Noosphere">Noogenesis</a></li> <li><a href="/wiki/Planetary_protection" title="Planetary protection">Planetary protection</a></li> <li><a href="/wiki/Potential_cultural_impact_of_extraterrestrial_contact" title="Potential cultural impact of extraterrestrial contact">Potential cultural impact of extraterrestrial contact</a></li> <li><a href="/wiki/Post-detection_policy" title="Post-detection policy">Post-detection policy</a></li> <li><a href="/wiki/San_Marino_Scale" title="San Marino Scale">San Marino Scale</a></li> <li><a href="/wiki/Technosignature" title="Technosignature">Technosignature</a></li> <li><a href="/wiki/UFO_religion" title="UFO religion">UFO religion</a></li> <li><a href="/wiki/Xenoarchaeology" title="Xenoarchaeology">Xenoarchaeology</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Evolutionary_biology" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Evolution" title="Template:Evolution"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Evolution" title="Template talk:Evolution"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Evolution" title="Special:EditPage/Template:Evolution"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Evolutionary_biology" style="font-size:114%;margin:0 4em"><a href="/wiki/Evolutionary_biology" title="Evolutionary biology">Evolutionary biology</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Introduction_to_evolution" title="Introduction to evolution">Introduction</a></li> <li><a href="/wiki/Outline_of_evolution" title="Outline of evolution">Outline</a></li> <li><a href="/wiki/Timeline_of_the_evolutionary_history_of_life" title="Timeline of the evolutionary history of life">Timeline of evolution</a></li> <li><a href="/wiki/History_of_life" title="History of life">History of life</a></li> <li><a href="/wiki/Index_of_evolutionary_biology_articles" title="Index of evolutionary biology articles">Index</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Evolution" title="Evolution">Evolution</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a></li> <li><a href="/wiki/Adaptation" title="Adaptation">Adaptation</a></li> <li><a href="/wiki/Adaptive_radiation" title="Adaptive radiation">Adaptive radiation</a></li> <li><a href="/wiki/Altruism_(biology)" title="Altruism (biology)">Altruism</a> <ul><li><a href="/wiki/Cheating_(biology)" title="Cheating (biology)">Cheating</a></li> <li><a href="/wiki/Reciprocal_altruism" title="Reciprocal altruism">Reciprocal</a></li></ul></li> <li><a href="/wiki/Baldwin_effect" title="Baldwin effect">Baldwin effect</a></li> <li><a href="/wiki/Cladistics" title="Cladistics">Cladistics</a></li> <li><a href="/wiki/Coevolution" title="Coevolution">Coevolution</a> <ul><li><a href="/wiki/Mutualism_(biology)" title="Mutualism (biology)">Mutualism</a></li></ul></li> <li><a href="/wiki/Common_descent" title="Common descent">Common descent</a></li> <li><a href="/wiki/Convergent_evolution" title="Convergent evolution">Convergence</a></li> <li><a href="/wiki/Divergent_evolution" title="Divergent evolution">Divergence</a></li> <li><a class="mw-selflink selflink">Earliest known life forms</a></li> <li><a href="/wiki/Evidence_of_common_descent" title="Evidence of common descent">Evidence of evolution</a></li> <li><a href="/wiki/Evolutionary_arms_race" title="Evolutionary arms race">Evolutionary arms race</a></li> <li><a href="/wiki/Evolutionary_pressure" title="Evolutionary pressure">Evolutionary pressure</a></li> <li><a href="/wiki/Exaptation" title="Exaptation">Exaptation</a></li> <li><a href="/wiki/Extinction" title="Extinction">Extinction</a> <ul><li><a href="/wiki/Extinction_event" title="Extinction event">Event</a></li></ul></li> <li><a href="/wiki/Homology_(biology)" title="Homology (biology)">Homology</a></li> <li><a href="/wiki/Last_universal_common_ancestor" title="Last universal common ancestor">Last universal common ancestor</a></li> <li><a href="/wiki/Macroevolution" title="Macroevolution">Macroevolution</a></li> <li><a href="/wiki/Microevolution" title="Microevolution">Microevolution</a></li> <li><a href="/wiki/Evolutionary_mismatch" title="Evolutionary mismatch">Mismatch</a></li> <li><a href="/wiki/Nonadaptive_radiation" title="Nonadaptive radiation">Non-adaptive radiation</a></li> <li><a href="/wiki/Abiogenesis" title="Abiogenesis">Origin of life</a></li> <li><a href="/wiki/Panspermia" title="Panspermia">Panspermia</a></li> <li><a href="/wiki/Parallel_evolution" title="Parallel evolution">Parallel evolution</a></li> <li><a href="/wiki/Signalling_theory" title="Signalling theory">Signalling theory</a> <ul><li><a href="/wiki/Handicap_principle" title="Handicap principle">Handicap principle</a></li></ul></li> <li><a href="/wiki/Speciation" title="Speciation">Speciation</a> <ul><li><a href="/wiki/Species" title="Species">Species</a></li> <li><a href="/wiki/Species_complex" title="Species complex">Species complex</a></li></ul></li> <li><a href="/wiki/Evolutionary_taxonomy" title="Evolutionary taxonomy">Taxonomy</a></li> <li><a href="/wiki/Unit_of_selection" title="Unit of selection">Unit of selection</a> <ul><li><a href="/wiki/Gene-centered_view_of_evolution" title="Gene-centered view of evolution">Gene-centered view of evolution</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Population_genetics" title="Population genetics">Population<br />genetics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Selective_breeding" title="Selective breeding">Artificial selection</a></li> <li><a href="/wiki/Biodiversity" title="Biodiversity">Biodiversity</a></li> <li><a href="/wiki/Evolutionarily_stable_strategy" title="Evolutionarily stable strategy">Evolutionarily stable strategy</a></li> <li><a href="/wiki/Fisher%27s_principle" title="Fisher's principle">Fisher's principle</a></li> <li><a href="/wiki/Fitness_(biology)" title="Fitness (biology)">Fitness</a> <ul><li><a href="/wiki/Inclusive_fitness" title="Inclusive fitness">Inclusive</a></li></ul></li> <li><a href="/wiki/Gene_flow" title="Gene flow">Gene flow</a></li> <li><a href="/wiki/Genetic_drift" title="Genetic drift">Genetic drift</a></li> <li><a href="/wiki/Kin_selection" title="Kin selection">Kin selection</a> <ul><li><a href="/wiki/Parental_investment" title="Parental investment">Parental investment</a></li> <li><a href="/wiki/Parent%E2%80%93offspring_conflict" title="Parent–offspring conflict">Parent–offspring conflict</a></li></ul></li> <li><a href="/wiki/Mutation" title="Mutation">Mutation</a></li> <li><a href="/wiki/Population" title="Population">Population</a></li> <li><a href="/wiki/Natural_selection" title="Natural selection">Natural selection</a></li> <li><a href="/wiki/Sexual_dimorphism" title="Sexual dimorphism">Sexual dimorphism</a></li> <li><a href="/wiki/Sexual_selection" title="Sexual selection">Sexual selection</a> <ul><li><a href="/wiki/Sexual_selection_in_flowering_plants" title="Sexual selection in flowering plants">Flowering plants</a></li> <li><a href="/wiki/Sexual_selection_in_fungi" title="Sexual selection in fungi">Fungi</a></li> <li><a href="/wiki/Mate_choice" title="Mate choice">Mate choice</a></li></ul></li> <li><a href="/wiki/Social_selection" title="Social selection">Social selection</a></li> <li><a href="/wiki/Trivers%E2%80%93Willard_hypothesis" title="Trivers–Willard hypothesis">Trivers–Willard hypothesis</a></li> <li><a href="/wiki/Genetic_variation" title="Genetic variation">Variation</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Development</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Canalisation_(genetics)" title="Canalisation (genetics)">Canalisation</a></li> <li><a href="/wiki/Evolutionary_developmental_biology" title="Evolutionary developmental biology">Evolutionary developmental biology</a></li> <li><a href="/wiki/Genetic_assimilation" title="Genetic assimilation">Genetic assimilation</a></li> <li><a href="/wiki/Inversion_(evolutionary_biology)" title="Inversion (evolutionary biology)">Inversion</a></li> <li><a href="/wiki/Modularity_(biology)" title="Modularity (biology)">Modularity</a></li> <li><a href="/wiki/Phenotypic_plasticity" title="Phenotypic plasticity">Phenotypic plasticity</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Of <a href="/wiki/Taxon" title="Taxon">taxa</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Evolution_of_bacteria" title="Evolution of bacteria">Bacteria</a></li> <li><a href="/wiki/Evolution_of_birds" title="Evolution of birds">Birds</a> <ul><li><a href="/wiki/Origin_of_birds" title="Origin of birds">origin</a></li></ul></li> <li><a href="/wiki/Evolution_of_brachiopods" title="Evolution of brachiopods">Brachiopods</a></li> <li><a href="/wiki/Evolution_of_molluscs" title="Evolution of molluscs">Molluscs</a> <ul><li><a href="/wiki/Evolution_of_cephalopods" title="Evolution of cephalopods">Cephalopods</a></li></ul></li> <li><a href="/wiki/Dinosaur#Evolutionary_history" title="Dinosaur">Dinosaurs</a></li> <li><a href="/wiki/Evolution_of_fish" title="Evolution of fish">Fish</a></li> <li><a href="/wiki/Evolution_of_fungi" title="Evolution of fungi">Fungi</a></li> <li><a href="/wiki/Evolution_of_insects" title="Evolution of insects">Insects</a> <ul><li><a href="/wiki/Evolution_of_butterflies" title="Evolution of butterflies">butterflies</a></li></ul></li> <li><a href="/wiki/History_of_life" title="History of life">Life</a></li> <li><a href="/wiki/Evolution_of_mammals" title="Evolution of mammals">Mammals</a> <ul><li><a href="/wiki/Cat_gap" title="Cat gap">cats</a></li> <li><a href="/wiki/Canidae#Evolution" title="Canidae">canids</a> <ul><li><a href="/wiki/Evolution_of_the_wolf" title="Evolution of the wolf">wolves</a></li> <li><a href="/wiki/Domestication_of_the_dog" title="Domestication of the dog">dogs</a></li></ul></li> <li><a href="/wiki/Hyena#Evolution" title="Hyena">hyenas</a></li> <li><a href="/wiki/Evolution_of_cetaceans" title="Evolution of cetaceans">dolphins and whales</a></li> <li><a href="/wiki/Evolution_of_the_horse" title="Evolution of the horse">horses</a></li> <li><a href="/wiki/Evolution_of_Macropodidae" title="Evolution of Macropodidae">Kangaroos</a></li> <li><a href="/wiki/Evolution_of_primates" title="Evolution of primates">primates</a> <ul><li><a href="/wiki/Human_evolution" title="Human evolution">humans</a></li> <li><a href="/wiki/Evolution_of_lemurs" title="Evolution of lemurs">lemurs</a></li></ul></li> <li><a href="/wiki/Evolution_of_sirenians" title="Evolution of sirenians">sea cows</a></li></ul></li> <li><a href="/wiki/Evolutionary_history_of_plants" title="Evolutionary history of plants">Plants</a> <ul><li><a href="/wiki/Pollinator-mediated_selection" title="Pollinator-mediated selection">pollinator-mediated</a></li></ul></li> <li><a href="/wiki/Evolution_of_reptiles" title="Evolution of reptiles">Reptiles</a></li> <li><a href="/wiki/Evolution_of_spiders" title="Evolution of spiders">Spiders</a></li> <li><a href="/wiki/Evolution_of_tetrapods" title="Evolution of tetrapods">Tetrapods</a></li> <li><a href="/wiki/Viral_evolution" title="Viral evolution">Viruses</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Of <a href="/wiki/Organ_(anatomy)" class="mw-redirect" title="Organ (anatomy)">organs</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Evolution_of_cells" title="Evolution of cells">Cell</a></li> <li><a href="/wiki/Models_of_DNA_evolution" title="Models of DNA evolution">DNA</a></li> <li><a href="/wiki/Evolution_of_flagella" title="Evolution of flagella">Flagella</a></li> <li><a href="/wiki/Eukaryote#Origin_of_eukaryotes" title="Eukaryote">Eukaryotes</a> <ul><li><a href="/wiki/Symbiogenesis" title="Symbiogenesis">symbiogenesis</a></li> <li><a href="/wiki/Chromosome#Eukaryotes" title="Chromosome">chromosome</a></li> <li><a href="/wiki/Endomembrane_system#Evolution" title="Endomembrane system">endomembrane system</a></li> <li><a href="/wiki/Mitochondrion#Origin_and_evolution" title="Mitochondrion">mitochondria</a></li> <li><a href="/wiki/Cell_nucleus#Evolution" title="Cell nucleus">nucleus</a></li> <li><a href="/wiki/Plastid#Origin" title="Plastid">plastids</a></li></ul></li> <li>In animals <ul><li><a href="/wiki/Evolution_of_the_eye" title="Evolution of the eye">eye</a></li> <li><a href="/wiki/Hair#Evolution" title="Hair">hair</a></li> <li><a href="/wiki/Evolution_of_mammalian_auditory_ossicles" title="Evolution of mammalian auditory ossicles">auditory ossicle</a></li> <li><a href="/wiki/Evolution_of_nervous_systems" title="Evolution of nervous systems">nervous system</a></li> <li><a href="/wiki/Evolution_of_the_brain" title="Evolution of the brain">brain</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Of <a href="/wiki/Biological_process" title="Biological process">processes</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Evolution_of_ageing" title="Evolution of ageing">Aging</a> <ul><li><a href="/wiki/Death#Evolution_of_aging_and_mortality" title="Death">Death</a></li> <li><a href="/wiki/Programmed_cell_death#Evolutionary_origin_of_mitochondrial_apoptosis" title="Programmed cell death">Programmed cell death</a></li></ul></li> <li><a href="/wiki/Origin_of_avian_flight" title="Origin of avian flight">Avian flight</a></li> <li><a href="/wiki/Evolution_of_biological_complexity" title="Evolution of biological complexity">Biological complexity</a></li> <li><a href="/wiki/Cooperation_(evolution)" title="Cooperation (evolution)">Cooperation</a></li> <li><a href="/wiki/Evolution_of_color_vision" title="Evolution of color vision">Color vision</a> <ul><li><a href="/wiki/Evolution_of_color_vision_in_primates" title="Evolution of color vision in primates">in primates</a></li></ul></li> <li><a href="/wiki/Evolution_of_emotion" title="Evolution of emotion">Emotion</a></li> <li><a href="/wiki/Empathy#Evolution_across_species" title="Empathy">Empathy</a></li> <li><a href="/wiki/Evolutionary_ethics" title="Evolutionary ethics">Ethics</a></li> <li><a href="/wiki/Evolution_of_eusociality" title="Evolution of eusociality">Eusociality</a></li> <li><a href="/wiki/Immune_system#Evolution_and_other_mechanisms" title="Immune system">Immune system</a></li> <li><a href="/wiki/Metabolism#Evolution" title="Metabolism">Metabolism</a></li> <li><a href="/wiki/Monogamy_in_animals" title="Monogamy in animals">Monogamy</a></li> <li><a href="/wiki/Evolution_of_morality" title="Evolution of morality">Morality</a></li> <li><a href="/wiki/Mosaic_evolution" title="Mosaic evolution">Mosaic evolution</a></li> <li><a href="/wiki/Multicellular_organism#Evolutionary_history" title="Multicellular organism">Multicellularity</a></li> <li><a href="/wiki/Evolution_of_sexual_reproduction" title="Evolution of sexual reproduction">Sexual reproduction</a> <ul><li><a href="/wiki/Anisogamy#Evolution" title="Anisogamy">Gamete differentiation/sexes</a></li> <li><a href="/wiki/Biological_life_cycle" title="Biological life cycle">Life cycles/nuclear phases</a></li> <li><a href="/wiki/Mating_type" title="Mating type">Mating types</a></li> <li><a href="/wiki/Origin_and_function_of_meiosis" title="Origin and function of meiosis">Meiosis</a></li> <li><a href="/wiki/Sex-determination_system#Evolution" title="Sex-determination system">Sex-determination</a></li></ul></li> <li><a href="/wiki/Evolution_of_snake_venom" title="Evolution of snake venom">Snake venom</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Tempo_and_Mode_in_Evolution" title="Tempo and Mode in Evolution">Tempo and modes</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Phyletic_gradualism" title="Phyletic gradualism">Gradualism</a>/<a href="/wiki/Punctuated_equilibrium" title="Punctuated equilibrium">Punctuated equilibrium</a>/<a href="/wiki/Saltation_(biology)" title="Saltation (biology)">Saltationism</a></li> <li><a href="/wiki/Point_mutation" title="Point mutation">Micromutation</a>/<a href="/wiki/Mutationism#Later_mutationist_theories" title="Mutationism">Macromutation</a></li> <li><a href="/wiki/Uniformitarianism" title="Uniformitarianism">Uniformitarianism</a>/<a href="/wiki/Catastrophism" title="Catastrophism">Catastrophism</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Speciation" title="Speciation">Speciation</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Allopatric_speciation" title="Allopatric speciation">Allopatric</a></li> <li><a href="/wiki/Anagenesis" title="Anagenesis">Anagenesis</a></li> <li><a href="/wiki/Catagenesis_(biology)" title="Catagenesis (biology)">Catagenesis</a></li> <li><a href="/wiki/Cladogenesis" title="Cladogenesis">Cladogenesis</a></li> <li><a href="/wiki/Cospeciation" title="Cospeciation">Cospeciation</a></li> <li><a href="/wiki/Ecological_speciation" title="Ecological speciation">Ecological</a></li> <li><a href="/wiki/Hybrid_speciation" title="Hybrid speciation">Hybrid</a></li> <li><a href="/wiki/Nonecological_speciation" title="Nonecological speciation">Non-ecological</a></li> <li><a href="/wiki/Parapatric_speciation" title="Parapatric speciation">Parapatric</a></li> <li><a href="/wiki/Peripatric_speciation" title="Peripatric speciation">Peripatric</a></li> <li><a href="/wiki/Reinforcement_(speciation)" title="Reinforcement (speciation)">Reinforcement</a></li> <li><a href="/wiki/Sympatric_speciation" title="Sympatric speciation">Sympatric</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/History_of_evolutionary_thought" title="History of evolutionary thought">History</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Evolutionary_ideas_of_the_Renaissance_and_Enlightenment" title="Evolutionary ideas of the Renaissance and Enlightenment">Renaissance and Enlightenment</a></li> <li><a href="/wiki/Transmutation_of_species" title="Transmutation of species">Transmutation of species</a></li> <li><a href="/wiki/David_Hume" title="David Hume">David Hume</a> <ul><li><i><a href="/wiki/Dialogues_Concerning_Natural_Religion" title="Dialogues Concerning Natural Religion">Dialogues Concerning Natural Religion</a></i></li></ul></li> <li><a href="/wiki/Charles_Darwin" title="Charles Darwin">Charles Darwin</a> <ul><li><i><a href="/wiki/On_the_Origin_of_Species" title="On the Origin of Species">On the Origin of Species</a></i></li></ul></li> <li><a href="/wiki/History_of_paleontology" title="History of paleontology">History of paleontology</a></li> <li><a href="/wiki/Transitional_fossil" title="Transitional fossil">Transitional fossil</a></li> <li><a href="/wiki/Blending_inheritance" title="Blending inheritance">Blending inheritance</a></li> <li><a href="/wiki/Mendelian_inheritance" title="Mendelian inheritance">Mendelian inheritance</a></li> <li><a href="/wiki/The_eclipse_of_Darwinism" title="The eclipse of Darwinism">The eclipse of Darwinism</a></li> <li><a href="/wiki/Neo-Darwinism" title="Neo-Darwinism">Neo-Darwinism</a></li> <li><a href="/wiki/Modern_synthesis_(20th_century)" title="Modern synthesis (20th century)">Modern synthesis</a></li> <li><a href="/wiki/History_of_molecular_evolution" title="History of molecular evolution">History of molecular evolution</a></li> <li><a href="/wiki/Extended_evolutionary_synthesis" title="Extended evolutionary synthesis">Extended evolutionary synthesis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Philosophy</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Darwinism" title="Darwinism">Darwinism</a></li> <li><a href="/wiki/Alternatives_to_Darwinian_evolution" title="Alternatives to Darwinian evolution">Alternatives</a> <ul><li><a href="/wiki/Catastrophism" title="Catastrophism">Catastrophism</a></li> <li><a href="/wiki/Lamarckism" title="Lamarckism">Lamarckism</a></li> <li><a href="/wiki/Orthogenesis" title="Orthogenesis">Orthogenesis</a></li> <li><a href="/wiki/Mutationism" title="Mutationism">Mutationism</a></li> <li><a href="/wiki/Saltation_(biology)" title="Saltation (biology)">Saltationism</a></li> <li><a href="/wiki/Structuralism_(biology)" title="Structuralism (biology)">Structuralism</a> <ul><li><a href="/wiki/Spandrel_(biology)" title="Spandrel (biology)">Spandrel</a></li></ul></li> <li><a href="/wiki/Theistic_evolution" title="Theistic evolution">Theistic</a></li> <li><a href="/wiki/Vitalism" title="Vitalism">Vitalism</a></li></ul></li> <li><a href="/wiki/Teleology_in_biology" title="Teleology in biology">Teleology in biology</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Biogeography" title="Biogeography">Biogeography</a></li> <li><a href="/wiki/Ecological_genetics" title="Ecological genetics">Ecological genetics</a></li> <li><a href="/wiki/Evolutionary_medicine" title="Evolutionary medicine">Evolutionary medicine</a></li> <li><a href="/wiki/Group_selection" title="Group selection">Group selection</a> <ul><li><a href="/wiki/Cultural_evolution" title="Cultural evolution">Cultural evolution</a></li> <li><a href="/wiki/Cultural_group_selection" title="Cultural group selection">Cultural group selection</a></li> <li><a href="/wiki/Dual_inheritance_theory" title="Dual inheritance theory">Dual inheritance theory</a></li></ul></li> <li><a href="/wiki/Hologenome_theory_of_evolution" title="Hologenome theory of evolution">Hologenome theory of evolution</a></li> <li><a href="/wiki/Missing_heritability_problem" title="Missing heritability problem">Missing heritability problem</a></li> <li><a href="/wiki/Molecular_evolution" title="Molecular evolution">Molecular evolution</a></li> <li><a href="/wiki/Astrobiology" title="Astrobiology">Astrobiology</a></li> <li><a href="/wiki/Phylogenetics" title="Phylogenetics">Phylogenetics</a> <ul><li><a href="/wiki/Phylogenetic_tree" title="Phylogenetic tree">Tree</a></li></ul></li> <li><a href="/wiki/Polymorphism_(biology)" title="Polymorphism (biology)">Polymorphism</a></li> <li><a href="/wiki/Protocell" title="Protocell">Protocell</a></li> <li><a href="/wiki/Systematics" title="Systematics">Systematics</a></li> <li><a href="/wiki/Transgenerational_epigenetic_inheritance" title="Transgenerational epigenetic inheritance">Transgenerational epigenetic inheritance</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Evolutionary_biology" title="Category:Evolutionary biology">Category</a></li> <li><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Symbol_portal_class.svg" class="mw-file-description" title="Portal"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/e/e2/Symbol_portal_class.svg/16px-Symbol_portal_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/e/e2/Symbol_portal_class.svg/23px-Symbol_portal_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/e/e2/Symbol_portal_class.svg/31px-Symbol_portal_class.svg.png 2x" data-file-width="180" data-file-height="185" /></a></span> <a href="/wiki/Portal:Evolutionary_biology" title="Portal:Evolutionary biology">Portal</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Molecules_detected_in_outer_space" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Molecules_detected_in_outer_space" title="Template:Molecules detected in outer space"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Molecules_detected_in_outer_space" title="Template talk:Molecules detected in outer space"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Molecules_detected_in_outer_space" title="Special:EditPage/Template:Molecules detected in outer space"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Molecules_detected_in_outer_space" style="font-size:114%;margin:0 4em"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules" title="List of interstellar and circumstellar molecules">Molecules detected in outer space</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Molecule" title="Molecule">Molecules</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diatomic_molecule" title="Diatomic molecule">Diatomic</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aluminium_monochloride" title="Aluminium monochloride">Aluminium monochloride</a></li> <li><a href="/wiki/Aluminium_monofluoride" title="Aluminium monofluoride">Aluminium monofluoride</a></li> <li><a href="/wiki/Aluminium(II)_oxide" title="Aluminium(II) oxide">Aluminium(II) oxide</a></li> <li><a href="/wiki/Argonium" title="Argonium">Argonium</a></li> <li><a href="/wiki/Carbon_cation" class="mw-redirect" title="Carbon cation">Carbon cation</a></li> <li><a href="/wiki/Carbon_monophosphide" title="Carbon monophosphide">Carbon monophosphide</a></li> <li><a href="/wiki/Carbon_monosulfide" title="Carbon monosulfide">Carbon monosulfide</a></li> <li><a href="/wiki/Carbon_monoxide" title="Carbon monoxide">Carbon monoxide</a></li> <li><a href="/wiki/Cyano_radical" title="Cyano radical">Cyano radical</a></li> <li><a href="/wiki/Diatomic_carbon" title="Diatomic carbon">Diatomic carbon</a></li> <li><a href="/w/index.php?title=Fluoromethylidynium&action=edit&redlink=1" class="new" title="Fluoromethylidynium (page does not exist)">Fluoromethylidynium</a></li> <li><a href="/wiki/Helium_hydride_ion" title="Helium hydride ion">Helium hydride ion</a></li> <li><a href="/wiki/Hydrogen_chloride" title="Hydrogen chloride">Hydrogen chloride</a></li> <li><a href="/wiki/Hydrogen_fluoride" title="Hydrogen fluoride">Hydrogen fluoride</a></li> <li><a href="/wiki/Hydrogen" title="Hydrogen">Hydrogen</a> (molecular)</li> <li><a href="/wiki/Hydroxyl_radical" title="Hydroxyl radical">Hydroxyl radical</a></li> <li><a href="/wiki/Iron(II)_oxide" title="Iron(II) oxide">Iron(II) oxide</a></li> <li><a href="/wiki/Magnesium_monohydride" title="Magnesium monohydride">Magnesium monohydride</a></li> <li><a href="/wiki/Methylidyne_radical" title="Methylidyne radical">Methylidyne radical</a></li> <li><a href="/wiki/Nitric_oxide" title="Nitric oxide">Nitric oxide</a></li> <li><a href="/wiki/Nitrogen" title="Nitrogen">Nitrogen</a> (molecular)</li> <li><a href="/wiki/Imidogen" title="Imidogen">Imidogen</a></li> <li><a href="/wiki/Sulfur_mononitride" title="Sulfur mononitride">Sulfur mononitride</a></li> <li><a href="/wiki/Oxygen" title="Oxygen">Oxygen</a> (molecular)</li> <li><a href="/wiki/Phosphorus_monoxide" title="Phosphorus monoxide">Phosphorus monoxide</a></li> <li><a href="/wiki/Phosphorus_mononitride" title="Phosphorus mononitride">Phosphorus mononitride</a></li> <li><a href="/wiki/Potassium_chloride" title="Potassium chloride">Potassium chloride</a></li> <li><a href="/wiki/Silicon_carbide" title="Silicon carbide">Silicon carbide</a></li> <li><a href="/wiki/Silicon_monoxide" title="Silicon monoxide">Silicon monoxide</a></li> <li><a href="/wiki/Silicon_monosulfide" title="Silicon monosulfide">Silicon monosulfide</a></li> <li><a href="/wiki/Sodium_chloride" title="Sodium chloride">Sodium chloride</a></li> <li><a href="/wiki/Sodium_iodide" title="Sodium iodide">Sodium iodide</a></li> <li><a href="/wiki/Sulfanyl" title="Sulfanyl">Sulfanyl</a></li> <li><a href="/wiki/Sulfur_monoxide" title="Sulfur monoxide">Sulfur monoxide</a></li> <li><a href="/wiki/Titanium(II)_oxide" title="Titanium(II) oxide">Titanium(II) oxide</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/Nitrous_oxide" title="Nitrous oxide"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/Nitrous-oxide-3D-balls.png/60px-Nitrous-oxide-3D-balls.png" decoding="async" width="60" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/Nitrous-oxide-3D-balls.png/90px-Nitrous-oxide-3D-balls.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/93/Nitrous-oxide-3D-balls.png/120px-Nitrous-oxide-3D-balls.png 2x" data-file-width="1100" data-file-height="441" /></a></span> <br /><br /><br /><br /> <span typeof="mw:File"><a href="/wiki/Ethanol" title="Ethanol"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Ethanol-3D-balls.png/60px-Ethanol-3D-balls.png" decoding="async" width="60" height="41" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Ethanol-3D-balls.png/90px-Ethanol-3D-balls.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b0/Ethanol-3D-balls.png/120px-Ethanol-3D-balls.png 2x" data-file-width="1100" data-file-height="754" /></a></span> <br /><br /><br /><br /> <span typeof="mw:File"><a href="/wiki/Buckminsterfullerene" title="Buckminsterfullerene"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Buckminsterfullerene-perspective-3D-balls.png/60px-Buckminsterfullerene-perspective-3D-balls.png" decoding="async" width="60" height="63" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Buckminsterfullerene-perspective-3D-balls.png/90px-Buckminsterfullerene-perspective-3D-balls.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Buckminsterfullerene-perspective-3D-balls.png/120px-Buckminsterfullerene-perspective-3D-balls.png 2x" data-file-width="1056" data-file-height="1100" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Triatomic_molecule" title="Triatomic molecule">Triatomic</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aluminium(I)_hydroxide" class="mw-redirect" title="Aluminium(I) hydroxide">Aluminium(I) hydroxide</a></li> <li><a href="/w/index.php?title=Aluminium_isocyanide&action=edit&redlink=1" class="new" title="Aluminium isocyanide (page does not exist)">Aluminium isocyanide</a></li> <li><a href="/wiki/Amino_radical" title="Amino radical">Amino radical</a></li> <li><a href="/wiki/Carbon_dioxide" title="Carbon dioxide">Carbon dioxide</a></li> <li><a href="/wiki/Carbonyl_sulfide" title="Carbonyl sulfide">Carbonyl sulfide</a></li> <li><a href="/w/index.php?title=CCP_radical&action=edit&redlink=1" class="new" title="CCP radical (page does not exist)">CCP radical</a></li> <li><a href="/wiki/Halonium_ion" title="Halonium ion">Chloronium</a></li> <li><a href="/wiki/Diazenylium" title="Diazenylium">Diazenylium</a></li> <li><a href="/wiki/Dicarbon_monoxide" title="Dicarbon monoxide">Dicarbon monoxide</a></li> <li><a href="/w/index.php?title=Disilicon_carbide&action=edit&redlink=1" class="new" title="Disilicon carbide (page does not exist)">Disilicon carbide</a></li> <li><a href="/wiki/Ethynyl_radical" title="Ethynyl radical">Ethynyl radical</a></li> <li><a href="/w/index.php?title=Formyl_radical&action=edit&redlink=1" class="new" title="Formyl radical (page does not exist)">Formyl radical</a></li> <li><a href="/wiki/Hydrogen_cyanide" title="Hydrogen cyanide">Hydrogen cyanide</a> (HCN)</li> <li><a href="/wiki/Hydrogen_isocyanide" title="Hydrogen isocyanide">Hydrogen isocyanide</a> (HNC)</li> <li><a href="/wiki/Hydrogen_sulfide" title="Hydrogen sulfide">Hydrogen sulfide</a></li> <li><a href="/wiki/Hydroperoxyl" title="Hydroperoxyl">Hydroperoxyl</a></li> <li><a href="/w/index.php?title=Iron_cyanide&action=edit&redlink=1" class="new" title="Iron cyanide (page does not exist)">Iron cyanide</a></li> <li><a href="/w/index.php?title=Isoformyl&action=edit&redlink=1" class="new" title="Isoformyl (page does not exist)">Isoformyl</a></li> <li><a href="/wiki/Magnesium_cyanide" title="Magnesium cyanide">Magnesium cyanide</a></li> <li><a href="/w/index.php?title=Magnesium_isocyanide&action=edit&redlink=1" class="new" title="Magnesium isocyanide (page does not exist)">Magnesium isocyanide</a></li> <li><a href="/wiki/Methylene_(compound)" title="Methylene (compound)">Methylene</a></li> <li><a href="/wiki/Diazenylium" title="Diazenylium">N<sub>2</sub>H<sup>+</sup></a></li> <li><a href="/wiki/Nitrous_oxide" title="Nitrous oxide">Nitrous oxide</a></li> <li><a href="/wiki/Nitroxyl" title="Nitroxyl">Nitroxyl</a></li> <li><a href="/wiki/Ozone" title="Ozone">Ozone</a></li> <li><a href="/wiki/Methylidynephosphane" title="Methylidynephosphane">Methylidynephosphane</a></li> <li><a href="/wiki/Potassium_cyanide" title="Potassium cyanide">Potassium cyanide</a></li> <li><a href="/wiki/Trihydrogen_cation" title="Trihydrogen cation">Trihydrogen cation</a></li> <li><a href="/wiki/Sodium_cyanide" title="Sodium cyanide">Sodium cyanide</a></li> <li><a href="/wiki/Sodium_hydroxide" title="Sodium hydroxide">Sodium hydroxide</a></li> <li><a href="/w/index.php?title=Silicon_carbonitride&action=edit&redlink=1" class="new" title="Silicon carbonitride (page does not exist)">Silicon carbonitride</a></li> <li><a href="/w/index.php?title=C-Silicon_dicarbide&action=edit&redlink=1" class="new" title="C-Silicon dicarbide (page does not exist)">c-Silicon dicarbide</a></li> <li><a href="/w/index.php?title=SiNC&action=edit&redlink=1" class="new" title="SiNC (page does not exist)">SiNC</a></li> <li><a href="/wiki/Sulfur_dioxide" title="Sulfur dioxide">Sulfur dioxide</a></li> <li><a href="/w/index.php?title=Thioformyl&action=edit&redlink=1" class="new" title="Thioformyl (page does not exist)">Thioformyl</a></li> <li><a href="/wiki/Thioxoethenylidene" title="Thioxoethenylidene">Thioxoethenylidene</a></li> <li><a href="/wiki/Titanium_dioxide" title="Titanium dioxide">Titanium dioxide</a></li> <li><a href="/wiki/Tricarbon" title="Tricarbon">Tricarbon</a></li> <li><a href="/wiki/Water" title="Water">Water</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Four<br />atoms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acetylene" title="Acetylene">Acetylene</a></li> <li><a href="/wiki/Ammonia" title="Ammonia">Ammonia</a></li> <li><a href="/wiki/Isocyanic_acid" title="Isocyanic acid">Isocyanic acid</a></li> <li><a href="/wiki/Polyyne" title="Polyyne">Cyanoethynyl</a></li> <li><a href="/wiki/Interstellar_formaldehyde" title="Interstellar formaldehyde">Formaldehyde</a></li> <li><a href="/wiki/Fulminic_acid" title="Fulminic acid">Fulminic acid</a></li> <li><a href="/w/index.php?title=HCCN&action=edit&redlink=1" class="new" title="HCCN (page does not exist)">HCCN</a></li> <li><a href="/wiki/Hydrogen_peroxide" title="Hydrogen peroxide">Hydrogen peroxide</a></li> <li><a href="/w/index.php?title=Hydromagnesium_isocyanide&action=edit&redlink=1" class="new" title="Hydromagnesium isocyanide (page does not exist)">Hydromagnesium isocyanide</a></li> <li><a href="/wiki/Isocyanic_acid" title="Isocyanic acid">Isocyanic acid</a></li> <li><a href="/wiki/Thiocyanic_acid" title="Thiocyanic acid">Isothiocyanic acid</a></li> <li><a href="/w/index.php?title=Ketenyl&action=edit&redlink=1" class="new" title="Ketenyl (page does not exist)">Ketenyl</a></li> <li><a href="/w/index.php?title=Methylene_amidogen&action=edit&redlink=1" class="new" title="Methylene amidogen (page does not exist)">Methylene amidogen</a></li> <li><a href="/wiki/Methyl_cation" class="mw-redirect" title="Methyl cation">Methyl cation</a></li> <li><a href="/wiki/Methyl_radical" title="Methyl radical">Methyl radical</a></li> <li><a href="/wiki/Propynylidyne" title="Propynylidyne">Propynylidyne</a></li> <li><a href="/w/index.php?title=Protonated_carbon_dioxide&action=edit&redlink=1" class="new" title="Protonated carbon dioxide (page does not exist)">Protonated carbon dioxide</a></li> <li><a href="/wiki/Protonated_hydrogen_cyanide" title="Protonated hydrogen cyanide">Protonated hydrogen cyanide</a></li> <li><a href="/w/index.php?title=Silicon_tricarbide&action=edit&redlink=1" class="new" title="Silicon tricarbide (page does not exist)">Silicon tricarbide</a></li> <li><a href="/wiki/Thioformaldehyde" title="Thioformaldehyde">Thioformaldehyde</a></li> <li><a href="/wiki/Tricarbon_monoxide" title="Tricarbon monoxide">Tricarbon monoxide</a></li> <li><a href="/wiki/Tricarbon_monosulfide" title="Tricarbon monosulfide">Tricarbon monosulfide</a></li> <li><a href="/wiki/Thiocyanic_acid" title="Thiocyanic acid">Thiocyanic acid</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Five<br />atoms</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ammonium" title="Ammonium">Ammonium</a> ion</li> <li><a href="/wiki/Polyyne" title="Polyyne">Butadiynyl</a></li> <li><a href="/wiki/Carbodiimide" title="Carbodiimide">Carbodiimide</a></li> <li><a href="/wiki/Cyanamide" title="Cyanamide">Cyanamide</a></li> <li><a href="/wiki/Cyanoacetylene" title="Cyanoacetylene">Cyanoacetylene</a></li> <li><a href="/w/index.php?title=Cyanoformaldehyde&action=edit&redlink=1" class="new" title="Cyanoformaldehyde (page does not exist)">Cyanoformaldehyde</a></li> <li><a href="/wiki/Cyanomethyl" title="Cyanomethyl">Cyanomethyl</a></li> <li><a href="/wiki/Cyclopropenylidene" title="Cyclopropenylidene">Cyclopropenylidene</a></li> <li><a href="/wiki/Formic_acid" title="Formic acid">Formic acid</a></li> <li><a href="/w/index.php?title=Isocyanoacetylene&action=edit&redlink=1" class="new" title="Isocyanoacetylene (page does not exist)">Isocyanoacetylene</a></li> <li><a href="/wiki/Ketene" title="Ketene">Ketene</a></li> <li><a href="/wiki/Methane" title="Methane">Methane</a></li> <li><a href="/wiki/Methoxy" class="mw-redirect" title="Methoxy">Methoxy radical</a></li> <li><a href="/w/index.php?title=Methylenimine&action=edit&redlink=1" class="new" title="Methylenimine (page does not exist)">Methylenimine</a></li> <li><a href="/w/index.php?title=Propadienylidene&action=edit&redlink=1" class="new" title="Propadienylidene (page does not exist)">Propadienylidene</a></li> <li><a href="/w/index.php?title=Protonated_formaldehyde&action=edit&redlink=1" class="new" title="Protonated formaldehyde (page does not exist)">Protonated formaldehyde</a></li> <li><a href="/wiki/Silane" title="Silane">Silane</a></li> <li><a href="/w/index.php?title=Silicon-carbide_cluster&action=edit&redlink=1" class="new" title="Silicon-carbide cluster (page does not exist)">Silicon-carbide cluster</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Six<br />atoms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acetonitrile" title="Acetonitrile">Acetonitrile</a></li> <li><a href="/w/index.php?title=Cyanobutadiynyl_radical&action=edit&redlink=1" class="new" title="Cyanobutadiynyl radical (page does not exist)">Cyanobutadiynyl radical</a></li> <li><a href="/w/index.php?title=E-Cyanomethanimine&action=edit&redlink=1" class="new" title="E-Cyanomethanimine (page does not exist)">E-Cyanomethanimine</a></li> <li><a href="/wiki/Cyclopropenone" title="Cyclopropenone">Cyclopropenone</a></li> <li><a href="/wiki/Diacetylene" title="Diacetylene">Diacetylene</a></li> <li><a href="/wiki/Ethylene" title="Ethylene">Ethylene</a></li> <li><a href="/wiki/Formamide" title="Formamide">Formamide</a></li> <li><a href="/w/index.php?title=HC4N&action=edit&redlink=1" class="new" title="HC4N (page does not exist)">HC<sub>4</sub>N</a></li> <li><a href="/wiki/Ketenimine" class="mw-redirect" title="Ketenimine">Ketenimine</a></li> <li><a href="/wiki/Methanethiol" title="Methanethiol">Methanethiol</a></li> <li><a href="/wiki/Methanol" title="Methanol">Methanol</a></li> <li><a href="/wiki/Methyl_isocyanide" title="Methyl isocyanide">Methyl isocyanide</a></li> <li><a href="/wiki/Polyyne" title="Polyyne">Pentynylidyne</a></li> <li><a href="/wiki/Propynal" class="mw-redirect" title="Propynal">Propynal</a></li> <li><a href="/w/index.php?title=Protonated_cyanoacetylene&action=edit&redlink=1" class="new" title="Protonated cyanoacetylene (page does not exist)">Protonated cyanoacetylene</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Seven<br />atoms</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acetaldehyde" title="Acetaldehyde">Acetaldehyde</a></li> <li><a href="/wiki/Acrylonitrile" title="Acrylonitrile">Acrylonitrile</a> <ul><li><a href="/wiki/Vinyl_cyanide" class="mw-redirect" title="Vinyl cyanide">Vinyl cyanide</a></li></ul></li> <li><a href="/wiki/Cyanopolyyne" title="Cyanopolyyne">Cyanodiacetylene</a></li> <li><a href="/wiki/Ethylene_oxide" title="Ethylene oxide">Ethylene oxide</a></li> <li><a href="/wiki/Glycolonitrile" title="Glycolonitrile">Glycolonitrile</a></li> <li><a href="/wiki/Hexatriynyl_radical" title="Hexatriynyl radical">Hexatriynyl radical</a></li> <li><a href="/wiki/Propyne" title="Propyne">Propyne</a></li> <li><a href="/wiki/Methylamine" title="Methylamine">Methylamine</a></li> <li><a href="/wiki/Methyl_isocyanate" title="Methyl isocyanate">Methyl isocyanate</a></li> <li><a href="/wiki/Vinyl_alcohol" title="Vinyl alcohol">Vinyl alcohol</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Eight<br />atoms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acetic_acid" title="Acetic acid">Acetic acid</a></li> <li><a href="/wiki/Aminoacetonitrile" title="Aminoacetonitrile">Aminoacetonitrile</a></li> <li><a href="/w/index.php?title=Cyanoallene&action=edit&redlink=1" class="new" title="Cyanoallene (page does not exist)">Cyanoallene</a></li> <li><a href="/wiki/Ethanimine" title="Ethanimine">Ethanimine</a></li> <li><a href="/wiki/Glycolaldehyde" title="Glycolaldehyde">Glycolaldehyde</a></li> <li><a href="/wiki/Polyyne" title="Polyyne">Hexapentaenylidene</a></li> <li><a href="/wiki/Polyyne" title="Polyyne">Methylcyanoacetylene</a></li> <li><a href="/wiki/Methyl_formate" title="Methyl formate">Methyl formate</a></li> <li><a href="/wiki/Acrolein" title="Acrolein">Acrolein</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Nine<br />atoms</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acetamide" title="Acetamide">Acetamide</a></li> <li><a href="/wiki/Cyanopolyyne" title="Cyanopolyyne">Cyanohexatriyne</a></li> <li><a href="/wiki/Dimethyl_ether" title="Dimethyl ether">Dimethyl ether</a></li> <li><a href="/wiki/Ethanol" title="Ethanol">Ethanol</a></li> <li><a href="/wiki/Polyyne" title="Polyyne">Methyldiacetylene</a></li> <li><a href="/wiki/Octatetraynyl_radical" title="Octatetraynyl radical">Octatetraynyl radical</a></li> <li><a href="/wiki/Propene" class="mw-redirect" title="Propene">Propene</a></li> <li><a href="/wiki/Ethanethiol" title="Ethanethiol">Ethanethiol</a></li> <li><a href="/wiki/Propionitrile" title="Propionitrile">Propionitrile</a></li> <li><a href="/wiki/N-Methylformamide" title="N-Methylformamide">N-Methylformamide</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Ten<br />atoms<br />or more</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acetone" title="Acetone">Acetone</a></li> <li><a href="/wiki/Benzene" title="Benzene">Benzene</a></li> <li><a href="/wiki/Benzonitrile" title="Benzonitrile">Benzonitrile</a></li> <li><a href="/wiki/Buckminsterfullerene" title="Buckminsterfullerene">Buckminsterfullerene</a> (C<sub>60</sub>, C<sub>60</sub><sup>+</sup>, fullerene, buckyball)</li> <li><a href="/wiki/C70_fullerene" title="C70 fullerene">C<sub>70</sub> fullerene</a></li> <li><a href="/wiki/Cyanopolyyne" title="Cyanopolyyne">Cyanodecapentayne</a></li> <li><a href="/wiki/Ethylene_glycol" title="Ethylene glycol">Ethylene glycol</a></li> <li><a href="/wiki/Ethyl_formate" title="Ethyl formate">Ethyl formate</a></li> <li><a href="/wiki/Methyl_acetate" title="Methyl acetate">Methyl acetate</a></li> <li><a href="/wiki/Cyanopolyyne" title="Cyanopolyyne">Methyl-cyano-diacetylene</a></li> <li><a href="/wiki/Polyyne" title="Polyyne">Methyltriacetylene</a></li> <li><a href="/wiki/Propionaldehyde" title="Propionaldehyde">Propionaldehyde</a></li> <li><a href="/wiki/Butyronitrile" title="Butyronitrile">Butyronitrile</a></li> <li><a href="/wiki/Pyrimidine" title="Pyrimidine">Pyrimidine</a></li> <li><a href="/w/index.php?title=Heptatrienyl_radical&action=edit&redlink=1" class="new" title="Heptatrienyl radical (page does not exist)">Heptatrienyl radical</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Deuterium" title="Deuterium">Deuterated</a><br />molecules</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ammonia" title="Ammonia">Ammonia</a></li> <li><a href="/wiki/Ammonium" title="Ammonium">Ammonium</a> ion</li> <li><a href="/wiki/Formaldehyde" title="Formaldehyde">Formaldehyde</a></li> <li><a href="/wiki/Interstellar_formaldehyde#Interstellar_reactions" title="Interstellar formaldehyde">Formyl radical</a></li> <li><a href="/wiki/Heavy_water" title="Heavy water">Heavy water</a></li> <li><a href="/wiki/Hydrogen_cyanide" title="Hydrogen cyanide">Hydrogen cyanide</a></li> <li><a href="/wiki/Hydrogen_deuteride" title="Hydrogen deuteride">Hydrogen deuteride</a></li> <li><a href="/wiki/Hydrogen_isocyanide" title="Hydrogen isocyanide">Hydrogen isocyanide</a></li> <li><a href="/wiki/Propyne" title="Propyne">Propyne</a></li> <li><a href="/wiki/Diazenylium" title="Diazenylium">N<sub>2</sub>D<sup>+</sup></a></li> <li><a href="/wiki/Trihydrogen_cation" title="Trihydrogen cation">Trihydrogen cation</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#Molecules" title="List of interstellar and circumstellar molecules">Unconfirmed</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anthracene" title="Anthracene">Anthracene</a></li> <li><a href="/wiki/Dihydroxyacetone" title="Dihydroxyacetone">Dihydroxyacetone</a></li> <li><a href="/wiki/Methoxyethane" title="Methoxyethane">Methoxyethane</a></li> <li><a href="/wiki/Glycine" title="Glycine">Glycine</a></li> <li><a href="/wiki/Graphene" title="Graphene">Graphene</a></li> <li><a href="/wiki/Hemolithin" title="Hemolithin">Hemolithin</a></li> <li><a href="/w/index.php?title=H2NCO%2B&action=edit&redlink=1" class="new" title="H2NCO+ (page does not exist)">H<sub>2</sub>NCO<sup>+</sup></a></li> <li><a href="/wiki/Carbon" title="Carbon">Linear C<sub>5</sub></a></li> <li><a href="/wiki/Naphthalene" title="Naphthalene">Naphthalene cation</a></li> <li><a href="/wiki/Phosphine" title="Phosphine">Phosphine</a></li> <li><a href="/wiki/Pyrene" title="Pyrene">Pyrene</a></li> <li><a href="/wiki/Silylidyne" title="Silylidyne">Silylidyne</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_interstellar_and_circumstellar_molecules#See_also" title="List of interstellar and circumstellar molecules">Related</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abiogenesis" title="Abiogenesis">Abiogenesis</a></li> <li><a href="/wiki/Astrobiology" title="Astrobiology">Astrobiology</a></li> <li><a href="/wiki/Astrochemistry" title="Astrochemistry">Astrochemistry</a></li> <li><a href="/wiki/Atomic_and_molecular_astrophysics" title="Atomic and molecular astrophysics">Atomic and molecular astrophysics</a></li> <li><a href="/wiki/Chemical_formula" title="Chemical formula">Chemical formula</a></li> <li><a href="/wiki/Circumstellar_dust" title="Circumstellar dust">Circumstellar dust</a></li> <li><a href="/wiki/Circumstellar_envelope" title="Circumstellar envelope">Circumstellar envelope</a></li> <li><a href="/wiki/Cosmic_dust" title="Cosmic dust">Cosmic dust</a></li> <li><a href="/wiki/Cosmic_ray" title="Cosmic ray">Cosmic ray</a></li> <li><a href="/wiki/Cosmochemistry" title="Cosmochemistry">Cosmochemistry</a></li> <li><a href="/wiki/Diffuse_interstellar_band" class="mw-redirect" title="Diffuse interstellar band">Diffuse interstellar band</a></li> <li><a class="mw-selflink selflink">Earliest known life forms</a></li> <li><a href="/wiki/Extraterrestrial_life" title="Extraterrestrial life">Extraterrestrial life</a></li> <li><a href="/wiki/Extraterrestrial_liquid_water" title="Extraterrestrial liquid water">Extraterrestrial liquid water</a></li> <li><a href="/wiki/Forbidden_mechanism" title="Forbidden mechanism">Forbidden mechanism</a></li> <li><a href="/wiki/Homochirality" title="Homochirality">Homochirality</a></li> <li><a href="/wiki/Intergalactic_dust" title="Intergalactic dust">Intergalactic dust</a></li> <li><a href="/wiki/Interplanetary_medium" title="Interplanetary medium">Interplanetary medium</a></li> <li><a href="/wiki/Interstellar_medium" title="Interstellar medium">Interstellar medium</a></li> <li><a href="/wiki/Photodissociation_region" title="Photodissociation region">Photodissociation region</a></li> <li><a href="/wiki/Iron%E2%80%93sulfur_world_theory" class="mw-redirect" title="Iron–sulfur world theory">Iron–sulfur world theory</a></li> <li><a href="/wiki/Kerogen" title="Kerogen">Kerogen</a></li> <li><a href="/wiki/Molecules_in_stars" title="Molecules in stars">Molecules in stars</a></li> <li><a href="/wiki/Nexus_for_Exoplanet_System_Science" title="Nexus for Exoplanet System Science">Nexus for Exoplanet System Science</a></li> <li><a href="/wiki/Organic_compound" title="Organic compound">Organic compound</a></li> <li><a href="/wiki/Outer_space" title="Outer space">Outer space</a></li> <li><a href="/wiki/PAH_world_hypothesis" title="PAH world hypothesis">PAH world hypothesis</a></li> <li><a href="/wiki/Pseudo-panspermia" title="Pseudo-panspermia">Pseudo-panspermia</a></li> <li><a href="/wiki/Polycyclic_aromatic_hydrocarbon" title="Polycyclic aromatic hydrocarbon">Polycyclic aromatic hydrocarbon</a> (PAH)</li> <li><a href="/wiki/RNA_world_hypothesis" class="mw-redirect" title="RNA world hypothesis">RNA world hypothesis</a></li> <li><a href="/wiki/Spectroscopy" title="Spectroscopy">Spectroscopy</a></li> <li><a href="/wiki/Tholin" title="Tholin">Tholin</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="font-weight: bold;"><div> <ul><li><b><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" 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0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">"<a href="/wiki/Prokaryote" title="Prokaryote">Prokaryota</a>"</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Archaea" title="Archaea">Archaea</a></li> <li><a href="/wiki/Bacteria" title="Bacteria">Bacteria</a> <ul><li><a href="/wiki/Mitochondrion" title="Mitochondrion">Mitochondrion</a></li> <li><a href="/wiki/Plastid" title="Plastid">Plastid</a></li></ul></li> <li><a href="/wiki/LUCA" class="mw-redirect" title="LUCA">LUCA</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Eukaryote" title="Eukaryote">Eukaryota</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Animal" title="Animal">Animalia</a></li> <li><a href="/wiki/Fungus" title="Fungus">Fungi</a></li> <li><a href="/wiki/Plant" title="Plant">Plantae</a></li> <li>'<a href="/wiki/Protist" title="Protist">Protista</a>'</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><i><a href="/wiki/Incertae_sedis" title="Incertae sedis">Incertae sedis</a></i></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Parakaryon" title="Parakaryon">Parakaryon</a></i></li> <li><a href="/wiki/Microbial_dark_matter#Microbes_with_highly_unusual_DNA" title="Microbial dark matter">Microbes with highly unusual DNA</a> (?)</li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Non-cellular life</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Virus" title="Virus">Virus</a> <hr /><a href="/wiki/Viroid" title="Viroid">Viroid</a> <hr /><a href="/wiki/Satellite_(biology)" title="Satellite (biology)">Satellite</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Realms</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Adnaviria" title="Adnaviria">Adnaviria</a></i></li> <li><i><a href="/wiki/Duplodnaviria" title="Duplodnaviria">Duplodnaviria</a></i></li> <li><i><a href="/wiki/Monodnaviria" title="Monodnaviria">Monodnaviria</a></i></li> <li><i><a href="/wiki/Riboviria" title="Riboviria">Riboviria</a></i></li> <li><i><a href="/wiki/Ribozyviria" title="Ribozyviria">Ribozyviria</a></i></li> <li><i><a href="/wiki/Varidnaviria" title="Varidnaviria">Varidnaviria</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Unassigned</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Classes</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><i><a href="/wiki/Naldaviricetes" title="Naldaviricetes">Naldaviricetes</a></i></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Families</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Alphasatellitidae" class="mw-redirect" title="Alphasatellitidae">Alphasatellitidae</a></i></li> <li><i><a href="/wiki/Ampullaviridae" title="Ampullaviridae">Ampullaviridae</a></i></li> <li><i><a href="/wiki/Anelloviridae" title="Anelloviridae">Anelloviridae</a></i></li> <li><i><a href="/wiki/Avsunviroidae" title="Avsunviroidae">Avsunviroidae</a></i></li> <li><i><a href="/wiki/Bicaudaviridae" title="Bicaudaviridae">Bicaudaviridae</a></i></li> <li><i><a href="/wiki/Clavaviridae" title="Clavaviridae">Clavaviridae</a></i></li> <li><i><a href="/wiki/Finnlakeviridae" title="Finnlakeviridae">Finnlakeviridae</a></i></li> <li><i><a href="/wiki/Fuselloviridae" title="Fuselloviridae">Fuselloviridae</a></i></li> <li><i><a href="/wiki/Globuloviridae" title="Globuloviridae">Globuloviridae</a></i></li> <li><i><a href="/wiki/Guttaviridae" title="Guttaviridae">Guttaviridae</a></i></li> <li><i><a href="/wiki/Halspiviridae" title="Halspiviridae">Halspiviridae</a></i></li> <li><i><a href="/wiki/Ovaliviridae" title="Ovaliviridae">Ovaliviridae</a></i></li> <li><i><a href="/wiki/Plasmaviridae" title="Plasmaviridae">Plasmaviridae</a></i></li> <li><i><a href="/wiki/Polydnaviridae" class="mw-redirect" title="Polydnaviridae">Polydnaviridae</a></i></li> <li><i><a href="/wiki/Portogloboviridae" title="Portogloboviridae">Portogloboviridae</a></i></li> <li><i><a href="/wiki/Pospiviroidae" title="Pospiviroidae">Pospiviroidae</a></i></li> <li><i><a href="/wiki/Spiraviridae" title="Spiraviridae">Spiraviridae</a></i></li> <li><i><a href="/wiki/Thaspiviridae" title="Thaspiviridae">Thaspiviridae</a></i></li> <li><i><a href="/wiki/Tolecusatellitidae" title="Tolecusatellitidae">Tolecusatellitidae</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Genera</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Dinodnavirus" title="Dinodnavirus">Dinodnavirus</a></i></li> <li><i><a href="/wiki/Rhizidiovirus" title="Rhizidiovirus">Rhizidiovirus</a></i></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Nanobe" title="Nanobe">Nanobe</a> (?)</li> <li><a href="/wiki/Obelisk_(biology)" title="Obelisk (biology)">Obelisk</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Comparable<br />structures</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bio-like_structure" title="Bio-like structure">Bio-like structure</a></li> <li><a href="/wiki/Cancer_cell" title="Cancer cell">Cancer cell</a> <ul><li><a href="/wiki/HeLa" title="HeLa">HeLa</a></li> <li><a href="/wiki/Clonally_transmissible_cancer" title="Clonally transmissible cancer">Clonally transmissible cancer</a></li></ul></li> <li><a href="/wiki/Cosmid" title="Cosmid">Cosmid</a></li> <li><a href="/wiki/Defective_interfering_particle" title="Defective interfering particle">Defective interfering particle</a></li> <li><a href="/wiki/Endogenous_viral_element" title="Endogenous viral element">Endogenous viral element</a></li> <li><a href="/wiki/Fosmid" title="Fosmid">Fosmid</a></li> <li><a href="/wiki/Integrative_and_conjugative_element" title="Integrative and conjugative element">Integrative and conjugative element</a></li> <li><a href="/wiki/Jeewanu" title="Jeewanu">Jeewanu</a></li> <li>"<i><a href="/wiki/Nanobacterium" title="Nanobacterium">Nanobacterium</a></i>"</li> <li><a href="/wiki/Phagemid" title="Phagemid">Phagemid</a></li> <li><a href="/wiki/Plasmid" title="Plasmid">Plasmid</a></li> <li><a href="/wiki/Prion" title="Prion">Prion</a> <ul><li><a href="/wiki/Fungal_prion" title="Fungal prion">Fungal prion</a></li></ul></li> <li><a href="/wiki/Proteinoid" title="Proteinoid">Proteinoid</a> <a href="/wiki/Microparticle#Biological_protocells" title="Microparticle">microsphere</a></li> <li>Retroelements not elsewhere classified <ul><li><a href="/wiki/Retron" title="Retron">Retron</a></li> <li><a href="/wiki/Diversity-generating_retroelement" title="Diversity-generating retroelement">Diversity-generating retroelement</a></li> <li><a href="/wiki/Telomerase_reverse_transcriptase" title="Telomerase reverse transcriptase">Telomerase reverse transcriptase</a></li> <li><a href="/wiki/Reverse_transcriptase-related_cellular_gene" class="mw-redirect" title="Reverse transcriptase-related cellular gene">Reverse transcriptase-related cellular gene</a></li></ul></li> <li><a href="/wiki/Ribozyme" title="Ribozyme">Ribozyme</a></li> <li><a href="/wiki/Spiegelman%27s_Monster" title="Spiegelman's 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