Adaptação de ursos polares ao frio aconteceu antes do que se pensava

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[{"selector":"#anim-cdb67bd7-2a05-4868-8b47-f19d71f4adff","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-cadd84a0-6bf9-409b-849c-2b702ccc0f8d","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5b78274c-e4c0-446f-a3a2-43a8d962415e","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-ef1b82c8-6536-46ee-947d-c77af7e96460","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-fa7dbcfe-ede7-45f8-8ced-f2d25feea905 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(-23.036225539436725%, 0, 0)","translate3d(0%, 0, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] Robert Sachowski/Unsplash Por meio da análise do genoma de 119 fósseis de ursos polares e 135 ursos pardos, os pesquisadores conseguiram definir que a diferenciação entre as espécies aconteceu há cerca de 70 mil anos

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[{"selector":"#anim-e9d9f136-9694-4826-88fc-5fbb8c6801cf","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-fd76f079-1633-4695-936b-21226ee72f66","keyframes":{"opacity":[0,1]},"delay":0,"duration":1500,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f1942805-e4bd-4b4b-a506-c479a3a555b7","keyframes":{"opacity":[0,1]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-0cf23dd7-8891-48f6-a88a-7aec85b05583","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-2d300134-fbbe-46a7-bc22-be0a14d37847 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate3d(-43.90509029881366%, 0, 0)","translate3d(0%, 0, 0)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] Pixabay/Pexels Os ursos polares têm duas camadas de pelo — uma felpuda (para os manter aquecidos) e uma externa (para preservar os animais secos)

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CNNBRASIL.COM.BR

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