I've checked all the options and I think that the right answer looks like this: Mollusks have highly developed olfactory receptors.
Structure and Function is my answer
The 3 and 4 are the structures at which the tympanic membrane to the oval window are communicated.
<h3>An example of a tympanic test</h3>
How well your middle ear is functioning is determined through a test called tympanometry. By tracking the motion of your eardrum, it does this. The outer ear, middle ear, and inner ear are all separate structures that make up your ear. You receive sound as energy or vibrations through your outer ear.
<h3>The tympanic bone's location is unknown.</h3>
The temporal bone's tympanic portion, which surrounds the external portion of the ear canal, is a curving plate of bone that sits under the squamous portion, in front of the mastoid process.
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