Question

as sound waves travel into the ear, they pass from the auditory canal to the:
tympanic membrane, auditory ossicles, oval window, endolymph, scala vestibuli of the cochlea
tympanic membrane, auditory ossicles, oval window, perilymph, scala vestibuli of the cochlea
tympanic membrane, oval window, auditory ossicles, perilymph, scala vestibuli of the cochlea
tympanic membrane, auditory ossicles, round window, perilymph, scala vestibuli of the cochlea

Explanation:

Sound waves enter the auditory canal and hit the tympanic membrane (eardrum). The vibrations are then transmitted to the auditory ossicles (malleus, incus, stapes). The stapes vibrates the oval window. The perilymph (a fluid) in the scala vestibuli (part of the cochlea) then gets affected. Endolymph is in a different part (scala media) and the round window's role is to dampen vibrations (not in the initial path as described in the correct sequence). Also, the oval window comes after the auditory ossicles in the pathway.

Answer:

Tympanic membrane, auditory ossicles, oval window, perilymph, scala vestibuli of the cochlea