Question

____________,___________
gastrula and morula are the various stages of embryo.​

Answer 1

Explanation:

The embryo during this process is called a gastrula. The germ layers are referred to as the ectoderm, mesoderm and endoderm. ... Ingression – migration of individual cells into the embryo (cells move with pseudopods) Invagination – infolding of cell sheet into embryo, forming the mouth, anus, and archenteron.

Answer 2

Explanation:

Blastula finally forms gastrula, which is three layered structure known as ectoderm, mesoderm and endoderm. Hence, correct sequence is Fertilization --> Cleavage --> Morula --> Blastula --> Gastrula.

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