77.In humans, the transparent sac that contains fluid that cushions the embryo and maintains a
constant temperature and pressure is the?
(A) Amnion;
(B) Yolk sac;
(C) Embryonic disc;
(D) Chorion.
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統計: A(5), B(1), C(1), D(1), E(0) #3325483
統計: A(5), B(1), C(1), D(1), E(0) #3325483