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US dollar54.39EGPEuro61.09EGPBritish pound72.84EGPSaudi riyal14.50EGPUAE dirham14.81EGPKuwaiti dinar175.65EGPJordanian dinar76.71EGPQatari riyal14.94EGPTurkish lira1.10EGPChinese yuan8.13EGPGold 247,108.98EGP/gGold 216,220.35EGP/gGold 185,331.73EGP/gSilver97.80EGP/g

Science & Tech

سرّ التماسيح التي عاشت قبل الديناصورات ونجت بعدها

By الشرق الأوسط · 25 minutes ago · 1 min read الشرق الأوسط ↗

سرّ التماسيح التي عاشت قبل الديناصورات ونجت بعدها

ما يعرفه ريفو عن الخبر

كشفت دراسة تعتمد على أكثر من 7 آلاف أحفورة عن تمسك التماسيح بالظروف المناخية الدافئة كسبب رئيسي لنجاتها عبر العصور.
ساعدت هذه السمة والخصائص الفسيولوجية التماسيح على الصمود أمام تداعيات اصطدام الكويكب بالأرض وانقراض الديناصورات قبل 66 مليون سنة.
توسعت التماسيح باتجاه القطبين خلال الفترات الأكثر دفئاً وانحسرت نحو خط الاستواء خلال الفترات الأكثر برودة.
تعد التماسيح الحديثة بقايا ناجية من مجموعة تطورية كانت تتمتع بتنوع استثنائي في الأدوار البيئية وأنواعها المنقرضة.

ظهرت السلالة التطوّرية للتماسيح، المعروفة باسم «أشباه السوكيات»، خلال العصر الترياسي، في أعقاب أسوأ موجة انقراض جماعي شهدتها الأرض…

المصدر: الشرق الأوسط

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