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Extraembryonic membrane purpose to store nitrogen wastes

Justify the extraembryonic membrane whose purpose is to store nitrogen wastes of embryo? Is this function present in placental mammalian embryos also?

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The allantois is extraembryonic membrane whose purpose is to store the excreted substance of the embryo. In placental mammals allantois is present but it doesn’t exert that purpose because the embryonic wastes are gathered by the mother’s body by the placenta.

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