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The bat can fly in the dark without coll...

The bat can fly in the dark without colliding with any obstacle.

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Because the bat can produce and hear the ultrasonic sound. The bat produces ultrasonic sound while flying These sound waves collide with any obstacle and return back to bat.s ear, which can be heard by the bat.
The nature of reflections tells the bat where the obstacle is and what it is like and hence can fly in the dark without colliding with any obstacle
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