Bats can ascertain distance, directions, nature and size

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Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted

1. ultrasonic waves from the bat
2. ultrasonic waves from the distant objects
3. supersonic waves from the bat
4. supersonic waves from the distant objects

Correct Option: A

Bat emitted ultrasonic sounds specifically to produce echoes. By comparing the outgoing pulse with the returning echoes the brain and auditory nervous system can produce detail image of surrounding.