A) trophoblast
B) follicle cells
C) formative cells
D) inner cell mass
Correct Answer: A
Solution :
Extra embryonic membranes of mammalian embryo or foetal membranes are derived from trophoblast (an epithelium surrounding the mammalian blastocysts). These membranes are yolk sac, amnion, chorion and allantois. They helps in respiration, nutrition, excretion and protection.
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