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本帖最后由 细胞海洋 于 2013-1-5 08:47 编辑
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4 i. [ F/ c. D3 d! |$ m9 o" QCOVER Head of a juvenile Nile crocodile (Crocodylus niloticus). The irregular polygonal scales on the face and jaws of crocodiles are not controlled genetically. Instead, the patterns are generated through a self-organizational process in which the stiff skin cracks in a tensional stress field as the crocodile grows. See page 78. Photo: Michel C. Milinkovitch and Adrien Debry 6 U, N% U, t4 g- C% N
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发表于 2013-1-4 20:05
发表于 2013-1-4 22:14
