Nidology is the study of-----

Options :
  1. Cnidarians
  2. Cnidarians and coelenterates
  3. Mammals
  4. Bird nests

Answer and Explanation :-

Answer: Option 4


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By three methods we may learn wisdom: First, by reflection, which is noblest Second, by imitation, which is easiest and third by experience, which is the bitterest.