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A. Eardrum—thin piece of skin separating the outer and middle ear that
vibratesand amplifies sound waves before entering the middle ear
B. Cochlea—spiral-shaped tube of the inner ear that contains nerve endings
thatare needed for hearing
C. Middleear— central part of the ear that consists of the eardrum and a cavity
containingthree small bones
D. Eustachiantube —tube that connects the middle ear to the pharynx and
equalizesair pressure on either side of the eardrum