{"id":5415,"date":"2025-10-02T13:44:00","date_gmt":"2025-10-02T11:44:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=5415"},"modified":"2025-10-02T14:09:55","modified_gmt":"2025-10-02T12:09:55","slug":"dismoipourquoi-comment-loxygene-a-t-il-ete-cree","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2025\/10\/02\/dismoipourquoi-comment-loxygene-a-t-il-ete-cree\/","title":{"rendered":"#DisMoiPourquoi Comment l\u2019oxyg\u00e8ne a-t-il \u00e9t\u00e9 cr\u00e9\u00e9 ?"},"content":{"rendered":"<div class=\"real_text\">\n<p><p>Lorsque la Terre s&rsquo;est form&eacute;e, il y a environ 4,5 milliards d&rsquo;ann&eacute;es, il n&rsquo;y avait pas d&rsquo;oxyg&egrave;ne dans l&rsquo;atmosph&egrave;re. Il faudra attendre 2 milliards d&rsquo;ann&eacute;es pour que, au cours de l&rsquo;&eacute;volution des organismes unicellulaires, apparaissent des organismes qui ont la capacit&eacute; de transformer le dioxyde de carbone (le fameux CO2 qui r&eacute;chauffe actuellement le climat) dissout dans les oc&eacute;ans en oxyg&egrave;ne (O2). Ce m&eacute;canisme, que l&rsquo;on appelle la photosynth&egrave;se, est maintenant utilis&eacute; par beaucoup de plantes. En r&eacute;sum&eacute;, l&rsquo;oxyg&egrave;ne a &eacute;t&eacute; cr&eacute;&eacute; dans les oc&eacute;ans et est pass&eacute; lentement ensuite dans l&rsquo;atmosph&egrave;re. Enfin, il faudra presque 2 milliards d&rsquo;ann&eacute;es suppl&eacute;mentaires pour que le taux d&rsquo;oxyg&egrave;ne dans l&rsquo;atmosph&egrave;re atteigne celui que l&rsquo;on conna&icirc;t actuellement : 23%.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"Lorsque la Terre s&rsquo;est form&eacute;e, il y a environ 4,5&nbsp;milliards d&rsquo;ann&eacute;es, il n&rsquo;y avait pas d&rsquo;oxyg&egrave;ne dans l&rsquo;atmosph&egrave;re. Il faudra attendre 2&nbsp;milliards d&rsquo;ann&eacute;es pour que, au &#8230;","protected":false},"author":1,"featured_media":5416,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[918],"tags":[2543,1687,353,31],"news-destination":[],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-5415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil","tag-dismoipourquoi","tag-chercheurs","tag-sciences","tag-var","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/5415","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=5415"}],"version-history":[{"count":2,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/5415\/revisions"}],"predecessor-version":[{"id":5423,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/5415\/revisions\/5423"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/5416"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=5415"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=5415"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=5415"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=5415"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=5415"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=5415"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=5415"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}