A) cnidoblast
B) germinal vesicle
C) trophoblast
D) amnion
Correct Answer: C
Solution :
Blastula is a 64 celled stage, which contains a fluid filled cavity called blastocoel. This embryo is known as blastocyst and is comprised an inner cell mass, which is attached to embryonic or animal pole and an outer covering of cells called trophoectoderm or trophoblast.
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