The ectoderm, mesoderm, and endoderm are formed during the ________ stage of embryogenesis.
A) fertilization
B) cellular blastoderm
C) syncytial blastoderm
D) gastrulation

Question

Quizplus · Accepted Answer

The ectoderm, mesoderm, and endoderm are formed during the gastrulation stage of embryogenesis. This is when the blastula (formed during the cellular blastoderm or syncytial blastoderm stage) undergoes a series of cellular movements to form the three primary germ layers. Fertilization occurs prior to the blastula stage.

The Ectoderm, Mesoderm, and Endoderm Are Formed During the ________