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本帖最后由 细胞海洋 于 2013-1-5 08:47 编辑 # B! _3 z, `+ I0 q2 c. ?* I' W- k. i
" P8 {8 e; Z5 G0 W: {% cCOVER 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 . n' u5 j0 G3 N) B9 s& J& M0 l
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发表于 2013-1-4 20:05
