阿摩線上測驗
35. In amniotes, ____ is the extraembryonic membrane responsible for gas exchange. In eutherian mammals, it develops into a part of placenta.
(A)allantois
(B) amnion
(C)chorion
(D) yolk sac
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統計： A(1), B(1), C(3), D(0), E(0) #3386702
統計： A(1), B(1), C(3), D(0), E(0) #3386702
