Which of the following are produced by the wings of bats, making them able to fly in dark?

Options :
  1. sound waves
  2. ultrasonic waves
  3. infra-red rays
  4. ultraviolet rays


Answer and Explanation :-

Answer: Option 2

Explanation:

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For those who know the value of and exquisite taste of solitary freedom (for one is only free when alone), the act of leaving is the bravest and most beautiful of all.
-Isabelle Eberhardt The Nomad: The Diaries of Isabelle Eberhardt