問題詳情
12. Which of these characteristics contributed the most to vertebrate success inrelatively dry environments?
(A) the ability to maintain a constant body temperature
(B) the shelled, amniotic egg
(C) two pairs of appendages
(D) four-chambered heart
(E) greater speed of locomotion
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增