Problem: Why is the amniotic egg considered an important evolutionary breakthrough?A. It prolongs embryonic development. B. It permits internal fertilization to be replaced by external fertilization. C. It has a shell that increases gas exchange. D. It provides insulation to conserve heat. E. It allows deposition of eggs in a terrestrial environment.

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Amniotic Egg:

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Why is the amniotic egg considered an important evolutionary breakthrough?

A. It prolongs embryonic development. 

B. It permits internal fertilization to be replaced by external fertilization. 

C. It has a shell that increases gas exchange. 

D. It provides insulation to conserve heat. 

E. It allows deposition of eggs in a terrestrial environment.

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