Which one of the following characteristics is not shared by birds and mammals?
A
Ossified endoskeleton
B
Breathing using lungs
C
Viviparity
D
Warm blooded nature
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Solution
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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.
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