During the embryonic stage,the primary germ layers develop from the
A) placenta.
B) blastocyst.
C) embryonic disk.
D) uterus.
E) morula.

Question

Quizplus · Accepted Answer

The embryonic disk is formed from the inner cell mass of the blastocyst, which consists of a cluster of cells that will eventually develop into the embryo. The primary germ layers (ectoderm, mesoderm, and endoderm) develop from the embryonic disk during the embryonic stage. The placenta is formed from tissues of both the mother and the embryo/fetus and plays a role in providing nutrients and oxygen to the developing embryo/fetus. A morula is a stage of early embryonic development when the zygote has divided into a cluster of cells but has not yet formed an embryonic disk. The uterus is the muscular organ in which the embryo/fetus develops during pregnancy. Therefore, the correct answer is C.

During the Embryonic Stage,the Primary Germ Layers Develop from the