問題詳情

44. In humans, identical twins are produced by the separation of cells during
(A)organogenesis.
(B)blastomere cleavage.
(C)gastrulation.
(D) pattern formation.
(E)the development of notochord.

參考答案

答案：B
難度：簡單0.75
統計：A(0),B(30),C(2),D(1),E(1)