47. Which of the following vertebrates is first characterized by the presence of an amniotic egg?
(A) amphibians
(B) fishes
(C) reptiles
(D) mammals
(E) chordates

答案:登入後查看
統計: A(6), B(0), C(41), D(3), E(1) #3224828

詳解 (共 1 筆)

#6348444
 •羊膜卵(Amniotic egg) ...
(共 250 字,隱藏中)
前往觀看
6
0

私人筆記 (共 1 筆)

私人筆記#7562180
未解鎖


(共 0 字,隱藏中)
前往觀看
0
0