A) morula-formarion
B) blastula-formation
C) gastrula
D) neurulation
Correct Answer: C
Solution :
Gastrulation is the process by which a blastula is converted into gastrula. Gastrulation results in the formation of a new cavity archenteron which opens outside through blastopore. During gastrulation yolk plug is formed by endodermal cells which closes the blasiopore.
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