The mass of cells containing the three germ layers is called a
A) chorion.
B) blastula.
C) gastrula.
D) morula.
E) blastocyst.

Question

Quizplus · Accepted Answer

The formation of three germ layers (ectoderm, mesoderm, and endoderm) is a characteristic feature of the gastrula stage of embryonic development. The mass of cells containing these three layers is called the gastrula. A blastula is an early stage of development characterized by a hollow ball of cells. A morula is an early stage of embryonic development consisting of a solid ball of cells. A chorion is a membrane that surrounds the embryo and forms part of the placenta. A blastocyst is a later stage of embryonic development characterized by the formation of an inner cell mass and an outer layer of trophoblast cells.

The Mass of Cells Containing the Three Germ Layers Is