Saturday, March 20, 2004

Reptile, The embryo

The embryo of a reptile develops a thin sac, the amnion, that envelops the embryo and becomes filled with a watery fluid. The entire structure serves to protect the embryo from desiccation and mechanical injury. A parchment-like shell, which also contributes mechanical protection, is produced by the female parent and surrounds the amnion; between the shell and the


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