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Echolocation

Across
Animals use _______ by emitting a sound that hits objects within its path and reflects back to the animal.
________ is sound in the frequency range above that of human hearing.
Down
_____, whales and birds have been found to utilize echolocation.
_______ effect occurs when the bat and the receiver of the sound are moving towards each other.
The distinct feature of _______ orientation is that the animal produces a carrier signal and uses it to extract information from their surrounding environment.