Determine the placental mammalian embryos, Biology

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

The allantois is the extraembryonic membrane whose function is to keeps the excreted matter of the embryo.

In placental mammals the allantois is present but it does not exert that function as the embryonic wastes are collected by the mother's body through the placenta.

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