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

1. Ossified endoskeleton
2. Breathing using lungs
3. Viviparity
4. Warm blooded nature

Correct answer: Viviparity

Solution

Birds and mammals both have an ossified endoskeleton, breathe with lungs, and are warm-blooded. Viviparity means giving birth to live young, which is typical of mammals but not birds.

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