The fetus is contained within the ________.

A) yolk
B) amnion
C) placenta
D) blastocyst

Amnion

A thin membrane forming a closed sac around the embryo and fetus, containing the amniotic fluid which provides a protective environment.

Fetus

The stage of life from 8 weeks of gestation to birth.

Blastocyst

An early stage of embryonic development that consists of a sphere of cells surrounding a fluid-filled cavity and the inner cell mass that will eventually develop into a fetus.