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Question:

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

Breathing using lungs

Ossified endoskeleton

Viviparity

Warm blooded nature

Solution:

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