Cells of the yolk sac form the earliest _____, contribute the formation of the _____, and become the _____ or _____ of the fetus.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. Cells of the yolk sac form the earliest _____, contribute the formation of the _____, and become the _____ or _____ of the fetus.