Task: Question Answering
Input (English): 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 the bat does not produce sound waves on the bat will know its location.?
Output (English): against