Why Is The Amniotic Egg Considered An Important Evolutionary Breakthrough?

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Why Is The Amniotic Egg Considered An Important Evolutionary Breakthrough?

a. It has a shell that increases gas exchange. b. It allows incubation of eggs in a terrestrial environment. c. It prolongs embryonic development. d. It provides insulation to conserve heat. e. It permits internal fertilization to be replaced by external fertilization.
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b. It allows incubation of eggs in a terrestrial environment.

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