Endoderm + mesoderm = which extra-embryonic membrane(s)?
A)chorion
B)amnion
C)allantois
D)yolk sac
E)both yolk sac and allantois

Question

Quizplus · Accepted Answer

The yolk sac and allantois are both extra-embryonic membranes that develop from the endoderm and mesoderm layers. The yolk sac is involved in early blood cell and vessel formation, while the allantois is involved in the early fluid exchange between the embryo and the yolk sac.

Endoderm + Mesoderm = Which Extra-Embryonic Membrane(s)