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The inner cell mass first differentiates into which two layers?
AMesoderm and endoderm
BEctoderm and mesoderm
CEctoderm and endoderm
DTrophoblast and ectoderm
Answer & Solution
Correct answer: C. Ectoderm and endoderm
Right after implantation the inner cell mass forms an outer ectoderm and an inner endoderm, and mesoderm appears between them later.
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