問題詳情
46. The yolk sac of humans ______.
(A) stores nutrients to support the developing embryo
(B) is evidence of humans' relationship to egg-laying vertebrates
(C) secretes HCG
(D) absorbs nutrients from, and releases waste to, the mother's blood
(E) envelops the developing fetus
(A) stores nutrients to support the developing embryo
(B) is evidence of humans' relationship to egg-laying vertebrates
(C) secretes HCG
(D) absorbs nutrients from, and releases waste to, the mother's blood
(E) envelops the developing fetus
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