Which one of the following characteristics is not shared by birds and mammals?
Warm-blooded nature
Ossified endoskeleton
Breathing using lungs
Viviparity
Explanation:
Ossified endoskeleton, Breathing using lungs and Warm blooded nature are characteristic of both birds and mammals except Viviparity, as birds are Oviparous.
Ossified endoskeleton, Breathing using lungs and Warm blooded nature are characteristic of both birds and mammals except Viviparity, as birds are Oviparous.