Question

What is gastrulation? What are the changes that are brought about by
gastrulatio

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Answer 1

Answer:

During gastrulation in birds and mammals, epiblast cells converge at the midline and ingress at the primitive streak. Ingression of these cells results in formation of the mesoderm and replacement of some of the hypoblast cells to produce the definitive endoderm.

Explanation:

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Answer 2

The inner cell mass of the blastula begins the morphogenetic movements and starts the formation of the three germ layers, that is the ectoderm, endoderm, and the mesoderm. 

This cellular morphogenetic movement results in the formation of the gastrula and that the process is known as gastrulation.