A.
equalize pressure on both sides of the tympanum
B.
conduct sound waves to the brain
C.
help the animal maintain balance or posture
D.
transform sound waves into electric impulses
Correct Answer: Option A
Explanation
The part labelled II is the eustachian tube and it's function is to balance or equalize air pressure between the middle ear and the outside environment, ventilate the middle ear, and protect it from nasopharyngeal secretions and sound pressures.
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