The ossicular system of the ear
a. serves to keep the pressure on the two sides of the tympanic membrane equal.
b. increases the pressure of vibration as it transfers the sound wave from air in the outer ear to fluid in the inner ear.
c. assists in determining whether a sound comes from the front or rear.
d. is part of the vestibular apparatus.
e. is in direct contact with the tympanic membrane and the round window.
B
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