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Solution


Q.

Which one of the following characteristics is not shared by birds and mammals                     [2016]
1 Viviparity  
2 Warm-blooded nature  
3 Ossified endoskeleton  
4 Breathing using lungs  

Ans.

(1)

All birds are oviparous, while all mammals except Ornithorhynchus (duck-billed platypus) and Echidna or Tachyglossus (spiny anteater) are viviparous.