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Evolution

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turtle-headed sea snake

DARK MARK  This dark form of a turtle-headed sea snake is shedding its skin, and maybe some toxic trace metals along with it.

First flower reconstruction

FLOWER POWER  This 3-D reconstruction reveals what the first flowers may have looked like. Female reproductive organs (green), male reproductive organs (yellow), and petallike structures (white) are shown.

Ramazzottius varieornatus

EXTREME SURVIVALIST  Genetic analysis of tardigrades like this Ramazzottius varieornatus shown in a scanning electron micrograph are revealing what makes the tough little creatures tick.

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