Function of allantois in mammal is

Respiration only

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Excretion

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Nutrition, excretion and respiration

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Protection from shocks

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Solution

The correct option is C Nutrition, excretion and respiration
The allantois has four functions as follows:
It serves as an embryonic respiratory system.
It receives the excretions of the embryonic kidneys.
It absorbs albumen, which serves as nutrient (protein) for the embryo.
It absorbs calcium from the shell for the structural needs of the embryo.

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