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Mammalian embryos

Which extra embryonic membrane has the function to store the nitrogen wastes of embryo? Is this function present within the placental mammalian embryos?

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Allantois is the extra embryonic membrane which performs the function of storing the secreted matter of embryo. In the placental mammals, allantois is present however it does not exert that function as the embryonic wastes are gathered by the mother’s body through the placenta.

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