問題詳情
37. Why is the amniotic egg considered an important evolutionary breakthrough?
(A)It prolongs embryonic development.
(B)It provides insulation to conserve heat.
(C)It has a shell that increases gas exchange.
(D) It allows deposition of eggs in a terrestrial environment.
(E)It allows internal fertilization to be replaced by external fertilization.
(A)It prolongs embryonic development.
(B)It provides insulation to conserve heat.
(C)It has a shell that increases gas exchange.
(D) It allows deposition of eggs in a terrestrial environment.
(E)It allows internal fertilization to be replaced by external fertilization.
參考答案
答案：D
難度：適中0.548387
統計：A(5),B(1),C(2),D(17),E(3)
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