Which one of the following characteristics is not shared by birds and mammals?

Ossified endoskeleton

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Breathing using lungs

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Viviparity

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Warm blooded nature

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Solution

The correct option is C Viviparity
All the characteristics are shared by birds and mammals except viviparity.

Birds are oviparous while mammals are oviparous (prototherians) and viviparous (metatherians and eutherians).

Giving birth to living young that develop within the mother's body rather than hatching from eggs is called viviparity.
Viviparity is not shared by birds and mammals.

Therefore, the correct answer is option c.

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