It's due to more pressure as the sound is searched deep into the waters.<span> The adjustments were done to adapt and make clearer sounds.</span><span>
</span><span>Animal researchers use hydrophone arrays to determine the location of the whale calls. </span><span>Another equipment is the Sound Surveillance system, it is used on the sea floor once during the cold war to detect warships and submarines. But now it is used in researchers to understand animals in the ocean. </span>
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The answer is in the box. You do not need to write the y but that just helped me do the steps to get the answer