Primary germ layers are (A) ectoderm and inner cell mass only. (B) trophoblast, ectoderm and mes...

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Primary germ layers are
(A) ectoderm and inner cell mass only.
(B) trophoblast, ectoderm and mesoderm.
(C) endoderm and mesoderm only.
(D) ectoderm, endoderm and mesoderm.
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