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What is the chorioallantois membrane

What is the chorioallantois membrane existed in the embryonic growth of reptiles and birds? How does this membrane contribute in the energetic metabolism of the embryo?

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The chorioallantois membrane is made by juxtaposition of certain areas of the chorion and the allantois. As it is porous, the chorioallantois membrane permits the passage of gases among the embryo and the external therefore making aerobic cellular respiration probable.   

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