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Adaptation to terrestrial life

Why can the allantois be regarded as an adaptation to terrestrial life?

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The allantois is an adaptation to dry land since in embryos of oviparous terrestrial beings, such as reptiles and birds, the metabolic residuals can’t be at once excreted to the aquatic surrounds (like fishes and amphibian larvae do). It was essential then for look of a structure capable of storing embryonic excretes until hatching.

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