Which one of the following does not match a component of the amniotic egg with its primary function?
A. amnion-encloses embryo within an oxygen-filled cavity
B. yolk sac-provides food for the embryo
C. allantois-segregates nitrogenous wastes from embryo
D. chorion-exchange of respiratory gases; retention of water
E. shell-porous, protective covering
Answer: A
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