In birds and placental mammals, the embryo proper forms from the
A) trophoblast.
B) chorion.
C) amnion.
D) epiblast.
E) hypoblast.

Question

Quizplus · Accepted Answer

In birds and placental mammals, the embryo proper forms from the epiblast, which is located on the upper surface of the inner cell mass of the blastocyst. The trophoblast gives rise to the placenta, while the chorion and amnion play important roles in fetal development and protection. The hypoblast forms the yolk sac.

In Birds and Placental Mammals, the Embryo Proper Forms from the