A) allantois
B) chorion
C) amnion
D) embryo
Correct Answer: B
Solution :
The primary differentiation event during mammalian development occurs at blastocyt stage and leads to the lineation of inner cell mass and the trophoectoderm. Chorion is formed from the extra-embryonic mesoderm and two layers of trophoplast.You need to login to perform this action.
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