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the epiblast (outer germ layer of gastr...

the epiblast (outer germ layer of gastrula) forms the

A

Ectoderm

B

Mesoderm

C

Endoderm

D

None of the above.

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks what the epiblast, which is the outer germ layer of the gastrula, forms during embryonic development. 2. **Identifying the Layers**: In mammalian embryogenesis, the inner cell mass of the blastocyst differentiates into two distinct layers: the epiblast (primitive ectoderm) and the hypoblast (primitive endoderm). 3. **Role of the Epiblast**: The epiblast is the outermost layer of the gastrula. It plays a crucial role in the formation of the ectoderm and mesoderm. 4. **Differentiation of Germ Layers**: - The epiblast gives rise to the ectoderm, which will eventually form structures such as the skin and nervous system. - The hypoblast, on the other hand, gives rise to the endoderm, which forms internal structures like the gut lining. 5. **Conclusion**: Since the epiblast forms the ectoderm, the correct answer to the question is option A: Ectoderm. **Final Answer**: The epiblast (outer germ layer of gastrula) forms the ectoderm (Option A). ---
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