Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Dinosaur sun rabu da kakanninsu na archosaur a lokacin tsakiyar zuwa ƙarshen Triassic, kimanin shekaru miliyan 20 bayan da Permian <unk> Triassic extinction ya shafe kimanin kashi 95% na dukan rayuwa a duniya. Tsarin radiometric na kafa dutsen da ke dauke da burbushin halittu daga farkon dinosaur genus Eoraptor a shekaru miliyan 231.4 ya tabbatar da kasancewar sa a cikin burbushin halittu a wannan lokacin. Masana ilimin halittu suna tunanin cewa Eoraptor yayi kama da kakannin dukkan dinosaur; idan wannan gaskiya ne, halayensa sun nuna cewa dinosaur na farko sun kasance ƙananan, masu cin nama bipedal. Ganowa na farko, dinosaur-kamar ornithodirans kamar Marasuchus da Lagerpeton a cikin Argentina Tsakiyar Triassic strata yana tallafawa wannan ra'ayi; nazarin burbushin da aka gano ya nuna cewa waɗannan dabbobin sun kasance ƙananan, masu farauta bipedal. Dinosaur na iya bayyana tun farkon shekaru miliyan 243 da suka gabata, kamar yadda aka nuna ta ragowar jinsin Nyasasaurus daga wannan lokacin, kodayake burbushin da aka sani na waɗannan dabbobin ba su da yawa don faɗi idan dinosaur ne ko kuma dangin dinosaur na kusa. Kwanan nan, an ƙaddara cewa Staurikosaurus daga Tsarin Santa Maria ya kasance 233.23 Ma, yana mai da shi mafi tsufa a cikin shekarun ilimin ƙasa fiye da Eoraptor.Lokacin da dinosaur suka bayyana, ba su kasance dabbobi masu rinjaye ba. Gidajen ƙasa sun mamaye nau'ikan archosauromorphs da therapsids, kamar cynodonts da rhynchosaurs. Babban abokan hamayyarsu sune pseudosuchia, kamar aetosaurs, ornithosuchids da rauisuchians, waɗanda suka fi nasara fiye da dinosaur. Yawancin wadannan dabbobi sun mutu a Triassic, a daya daga cikin abubuwan biyu. Na farko, kimanin shekaru miliyan 215 da suka wuce, nau'ikan archosauromorphs na asali, gami da protorosaurs, sun mutu. Wannan ya biyo bayan Triassic-Jurassic extinction event (kimanin shekaru miliyan 200 da suka wuce), wanda ya ga ƙarshen yawancin sauran kungiyoyi na farkon archosaurs, kamar aetosaurs, ornithosuchids, phytosaurs, da rauisuchians. Rhynchosaurs da dicynodonts sun tsira (aƙalla a cikin...  Tambaya: Wane dinosaur ne masana ilimin halittu suka gaskata cewa shi ne wakilin jinsin?
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