The Extraembryonic Membrane That Forms a Fluid-Filled Sac is The

Question

The extraembryonic membrane that forms a fluid-filled sac is the
A) yolk sac.
B) amnion.
C) allantois.
D) chorion.
E) decidua.

Accepted Answer

The amnion is the extraembryonic membrane that forms a fluid-filled sac called the amniotic sac, which surrounds and protects the growing embryo/fetus.