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Bats can fly in the dark without hitting anything because

Q. Bats can fly in the dark without hitting anything because
 A   they are flying mammals
 B   their night vision is good
 C   they are guided by ultrasonic waves produced by them
 D   of no scientific reason
Answer:-they are guided by ultrasonic waves produced by them
Explanation:  

Bats’ ears are more important than their eyes – they use a special sonar system called ‘echolocation,’ meaning they find things using echoes.

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