Which is not a vestigial organ of man

Options :
  1. tail vertebrae
  2. vermiform appendix
  3. nictitating membrane
  4. glotis
Answer and Explanation :-

Answer: Option 4

Explanation:

The organs which are not developed in human but well developed in other animals are called vestigial organs.

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For beauty is nothing but the beginning of terrorwhich we are barely able to endure, and it amazes us so,because it serenely disdains to destroy us.Every angel is terrible.
-Rainer Maria Rilke Duino Elegies