Although most animals and some plants detect and respond to sound vibrations, the precisesensitivity that...

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Although most animals and some plants detect and respond to sound vibrations, the precisesensitivity that we call hearing is rare in the living world. It is highly developed only in birds andmammals, and the same operational system applies in all vertebrate auditory systems. Soundwaves cause a liquid within the organism's auditory apparatus to vibrate. These vibrations arepicked up by receptors that transmit signals to nerve cells. These cells then communicate thesound to the brain. Humans can hear vibrational frequencies of 20 to 20,000 cycles persecond; cats respond to frequencies of up to 50,000 cycles per second; and porpoises andbats pick up frequencies of 100,000 cycles per second.Which statement does the passage support?A. Humans have the best hearing of all animals.B. Cats and porpoises are adapted to hearing low frequencies.C. Ears are damaged by high frequencies.D. Some frequencies are beyond the human hearing range.E. Invertebrates have better "hearing" systems than vertebrates.

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