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


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All teachings are mere references. The true experience is living your own life. Then, even the holiest of words are only words.
-Deng Ming-Dao