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Chorioallantois membrane in the reptiles and birds

Which chorioallantois membrane present within the embryonic development of the reptiles and birds? How does this membrane participate within the energetic metabolism of embryo?

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The chorioallantois membrane is formed through the juxtaposition of some regions of chorion and allantois. As it is porous, the chorioallantois membrane enables the passage of gases between embryo and exterior therefore forming the aerobic cellular respiration possible.

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