Process:  -Bats fly through an area -The bat makes sounds with their mouth or nose -The sound waves travel away from the bat -The sound waves hit objects -The sound waves bounce off the objects back towards the bat -The bat hears the sound waves echoing off the objects -The bat knows where the objects are because of where the sound echoed from -The bat doesn't hurt itself by hitting the objects.
 Question: What is the effect of bats get scared on if more sound waves are produced outside.?
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