The placenta is
A. a site where fetal blood can enter the maternal circulation.
B. a site where maternal blood enters the fetal circulation.
C. formed from maternal circulatory stem cells, and serves as an exchange organ between mother and fetus.
D. a site formed by the proliferation of the maternal endometrium and myometrium.
E. a site of diffusion and transport of wastes, oxygen, and nutrients between fetal and maternal blood.
Answer: E
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