Sound waves are a ............, fluctuation in the air pressure, Echoes are the _____ heading back to the speaker., sound waves reflecting, Echoes could be used to calculate the_______ to an object., distance, Bats can ____ very well, but they need to _______ in the dark., see, hunt, Bats locate the animal they want to eat by the echo. The time it takes the sound to return and the ______ tell the bat where their prey is., intensity, Large prey sends back a _________., stronger sound, __________-frequency sounds give detailed information., varying frequency, Humans cannot ________ most bat sounds because of the frequency., hear

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