What happens during gastrulation?

A. Cells migrate to form a layered structure.
B. A fertilized egg divides mitotically to form a
ball of cells.
C. A gastrula is transformed into a blastula.
D. The embryo divides into distinct zones of
cell division, cell expansion, and cell
differentiation.
E. All of these events happen during
gastrulation.


A

Biology & Microbiology

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