{"id":716731,"date":"2026-10-06T05:07:03","date_gmt":"2026-10-06T05:07:03","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=716731"},"modified":"2026-10-06T05:07:03","modified_gmt":"2026-10-06T05:07:03","slug":"istoria-vietii-pe-pamant-rescrisa-animalele-ar-fi-aparut-cu-200-de-milioane-de-ani-mai-devreme","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=716731","title":{"rendered":"Istoria vie\u021bii pe P\u0103m\u00e2nt, rescris\u0103. Animalele ar fi ap\u0103rut cu 200 de milioane de ani mai devreme"},"content":{"rendered":"
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Studiul, publicat \u00een revista Science Advances<\/a>, a fost condus de Universitatea din Oxford.<\/p>\n

P\u00e2n\u0103 acum, speciali\u0219tii se bazau pe un z\u0103c\u0103m\u00e2nt fosil din China, vechi de circa 590 de milioane de ani. Biota Weng\u2019an p\u0103streaz\u0103 organisme microscopice extrem de detaliate, dar niciunul nu este cu certitudine un animal. De aici s-a tras concluzia c\u0103 primele animale au ap\u0103rut abia dup\u0103 aceast\u0103 perioad\u0103.<\/p>\n

Noile date vin din Mongolia<\/h2>\n

Cercet\u0103torii au analizat peste 140 de probe din Biota Kheseen. Aceasta este cu peste 40 de milioane de ani mai t\u00e2n\u0103r\u0103 dec\u00e2t Weng\u2019an. Folosind microscopia electronic\u0103, au descoperit specii noi de microfosile, inclusiv organisme sferice cu spini \u0219i forme asem\u0103n\u0103toare embrionilor.<\/p>\n

Niciuna nu a putut fi identificat\u0103 \u00eens\u0103 ca animal. Totu\u0219i, la acel moment animalele existau deja \u00een alte zone ale lumii, precum Namibia \u0219i sudul Chinei.<\/p>\n

Concluzia echipei este c\u0103 un z\u0103c\u0103m\u00e2nt bine conservat nu dovede\u0219te absen\u021ba animalelor. Acestea ar fi tr\u0103it \u00een alte medii sau condi\u021biile chimice nu le-ar fi permis fosilizarea.<\/p>\n

Cercet\u0103torii au aplicat apoi metoda \u201eceasului molecular\u201d, care compar\u0103 diferen\u021bele genetice dintre speciile actuale. Au folosit ca repere z\u0103c\u0103minte vechi de 850\u2013730 de milioane de ani, din Norvegia, Australia \u0219i Arizona.<\/p>\n

Estimarea a \u00eempins originea animalelor cu circa 200 de milioane de ani \u00een urm\u0103<\/h2>\n

Ea s-ar situa acum \u00eentre 800 \u0219i 700 de milioane de ani. Biomarkerii chimici indic\u0103 deja existen\u021ba unor bure\u021bi acum cel pu\u021bin 650 de milioane de ani.<\/p>\n

Primele animale ar fi fost mici, moi \u0219i f\u0103r\u0103 cochilii sau oase, deci greu de fosilizat. Ele ar fi putut ap\u0103rea chiar \u00eenainte de \u201eP\u0103m\u00e2ntul-bulg\u0103re de z\u0103pad\u0103\u201d, perioada glaciar\u0103 extrem\u0103 \u00eenceput\u0103 acum circa 720 de milioane de ani.<\/p>\n

Primul autor, doctorandul Orin Lole Durbin, avertizeaz\u0103 \u00eens\u0103 c\u0103 \u201eaceast\u0103 analiz\u0103 nu dovede\u0219te c\u0103 animalele existau acum 800 de milioane de ani\u201d, potrivit unui comunicat al Universit\u0103\u021bii din Oxford.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Studiul, publicat \u00een revista Science Advances, a fost condus de Universitatea din Oxford. P\u00e2n\u0103 acum, speciali\u0219tii se bazau pe un z\u0103c\u0103m\u00e2nt fosil din China, vechi de circa 590 de milioane … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":716732,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/716731"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=716731"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/716731\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/716732"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=716731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=716731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=716731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}