Biology
General
Easy

Question

First mammal occurred in which era/period?

  1. Permian –Palaeozoic  
  2. Triassic –Mesozoic  
  3. Tertiary –Coenozoic  
  4. None of these  

The correct answer is: Triassic –Mesozoic


    The Triassic period of Mesozoic era, the primitive amphibians became extinct some of the reptilian group returned to sea-life and some invaded air. Another important event which took place late in Triassic period was the first appearance of mammals, which retained egg laying habit.

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