Which extraembryonic membrane in birds is responsible for the storage of uric acid and also participates in gas exchange?
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Correct answer: Allantois
The allantois collects nitrogenous waste (primarily uric acid) produced by the embryo. As it expands, it fuses with the chorion to form the chorioallantoic membrane, which lies close to the porous shell and serves as the primary respiratory surface for gas exchange.
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