64. Which of the following is common to both avian and mammalian development?
(A) holoblastic cleavage.
(B) epiblast and hypoblast.
(C) trophoblast.
(D) yolk plug.
(E) gray crescent.

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統計: A(3), B(29), C(6), D(8), E(3) #1118796

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Yolk plug 卵黃塞作為胚胎的營養...
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