19. Bat can fly in dark because they A.Have strong wings B.Have sharp eyes C.Produce ultrasonic wave D.Are nocturnal
Answer: Option C Solution: Bats can fly in dark because they produce ultrasonic waves. The bats possess very poor vision. It cannot see in dark. It produces ultrasonic waves which strike with the obstacles present on its way. The bat receives its echo and changes its path to protect itself from collision.
