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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I hope she'll be a fool -- that's the best thing a girl can be in this world, a beautiful little fool.
-F. Scott Fitzgerald The Great Gatsby