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Allantois as adaptation to terrestrial life

Explain why allantois is considered as an adaptation to the terrestrial life?

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Allantois is an adaptation to the dry land since in embryos of the oviparous terrestrial beings, such as birds and reptiles, the metabolic residuals cannot be instantly excreted to aquatic surrounds (just like amphibian and fishes larvae do). It was essential then for appearance of structure capable of storing the embryonic excretes until the process of hatching.

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