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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.

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Athena 高三下 (2018/09/02)
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37. Why is the amniotic egg considered a..-阿摩線上測驗