What occurs during gastrulation?
A) A solid embryo is changed into a hollow morula.
B) A solid blastula is changed into a hollow embryo that has four tissue layers.
C) A hollow blastula is changed into a hollow embryo that has three tissue layers.
D) A neural tube is created by invagination of the ectoderm.

Question

Quizplus · Accepted Answer

Gastrulation is the process during embryonic development where a hollow blastula is reorganized into a structure with three primary layers: the ectoderm, mesoderm, and endoderm. This process forms the basis for the complex body structures in the developing embryo.

What Occurs During Gastrulation