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A. Eardrum—thin piece of skin separating the outer and middle ear that
vibrates and amplifies sound waves before entering the middle ear
B. Cochlea—spiral-shaped tube of the inner ear that contains nerve endings
that are needed for hearing
C. Middle ear—central part of the ear that consists of the eardrum and a cavity
containing three small bones
D. Eustachian tube—tube that connects the middle ear to the pharynx and
equalizes air pressure on either side of the eardrum