The embryonic membrane that completely encloses the embryo in a watery sac is the ________.

A) yolk sac
B) amnion
C) allantois
D) chorion
E) ectodermal sac

Amnion

A thin, protective membrane that surrounds the embryo or fetus in the amniotic sac, containing the amniotic fluid.

Embryonic Membrane

Membranes such as the amnion and chorion that develop during embryogenesis to protect and nourish the embryo.

Watery Sac

A fluid-filled bladder or cyst that can form in various parts of the body, often benign.