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As sound enters the ear, it vibrates the ______________ at the boundary between the outer ear and middle ear, causing the sound waves to then vibrate the hammer. a. ear drum c. stirrup b. cochlea d. anvil
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As sound enters the ear, it vibrates the ______________ at the boundary between the outer ear and middle ear, causing the sound waves to then vibrate the hammer.

a. ear drum
c. stirrup
b. cochlea
d. anvil

User Markiv
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2 Answers

3 votes
(A. eardrum <----- is the answer
User Gang Gao
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5 votes
A. The ear drum vibrates causing it to move the malleus causing sound.
User Rxantos
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