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Allantois as an adaptation to terrestrial life

Why can allantois be thought 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, similar to reptiles and birds, the metabolic residuals can’t be instantly excreted to the aquatic surrounds (like fishes and amphibian larvae do). It was essential then the appearing of a structure capable of storing up the embryonic excretes till hatching.

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