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.
i.肉鰭(lobed fin);ii.顎(jaw);iii.有指頭的四肢(limb with digit);iv.羊膜卵(amniotic egg)
v.頭部(head)
(A) v → iii → iv → i → ii (B) v → ii → i → iii → iv
(C) iii → iv → v → i → ii (D) v → ii → i → iv → iii