A) amnion
B) chorion
C) trophoblast
D) yolk sac
Correct Answer: D
Solution :
Yolk sac is an extra embryonic or foetal membrane. It is a membrane that surrounds the yolk. In mammals, it is reabsorbed before the embryo is borned. It is a first embryonic membranes, which begins to produce RBCs. Yolk sac is enclosed by outer mesoderm and inner endodermal layer.You need to login to perform this action.
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