alleryAt which embryonic stage are the primary germ layers first clearly established in animals?
AMorula
BBlastula
CGastrula
DNeurula
Answer & Solution
Correct answer: C. Gastrula
The germ layers are established during gastrulation, so the correct stage is the gastrula.
This is the stage at which ectoderm, endoderm, and in triploblastic animals mesoderm become organized.
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