Question

During the period of the embryo, the __________ becomes the __________.
A) mesoderm; nervous system, lungs, internal organs, and skin
B) chorion; endocrine system, muscles, placenta, and skeleton
C) ectoderm; circulatory system, skin, skeleton, and internal organs
D) endoderm; digestive system, lungs, urinary tract, and glands

Answer

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