Which one of the following characteristics is not shared by birds and mammals?
Correct answer: A. Viviparity
- A. Viviparity
- B. Warm blooded nature
- C. Ossified endoskeleton
- D. Breathing using lungs
Explanation
All birds are oviparous while all mammals except Ornithorhyncus (duck billed platypus) and Echidna or Tachyglossus (spiny anteater) are viviparous.
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