The Mesoderm and the Trophoblast Combine to Form The

Question

The mesoderm and the trophoblast combine to form the
A) amnion.
B) amniotic sac.
C) chorion.
D) allantois.
E) inner cell mass.

Accepted Answer

The chorion is formed when the mesoderm and the trophoblast combine.

Answer: A, B, D, E 
 None of these structures are formed by the combination of the mesoderm and the trophoblast. The amnion and amniotic sac are formed by the inner cell mass, while the allantois is formed by the yolk sac. The inner cell mass also gives rise to the embryo itself.