The incus, malleus, and stapes of the middle ear
A. are part of the vestibular apparatus.
B. are found inside the cochlear duct.
C. serve to amplify the pressure of sound vibrations from the air in the outer ear to the fluid in the inner ear.
D. serve to keep the pressure on the two sides of the tympanic membrane equal.
E. are in direct contact with both the tympanic membrane and the round window.
Answer: C
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