Wax impacted in the External Auditory Meatus can cause a Conductive Hearing loss
Another fact about a Conductive loss is that it is usually (3) remediable by medical and/or other means, i.e., hearing can be recovered. If I tickle a student under the armpits, they will remove their fingers from their ears and hear normally.
Wax accumulation in the External Auditory Meatus can can be another common cause of a Conductive loss. Basically, wax is exuded by special cells in the ear canal as a means of cleansing the ear.
Dust particles, or parts of hapless insects if they have wandered in there, are embedded in the wax and are removed when the wax falls out.
Some times the wax doesn't fall out and becomes impacted in the canal. If it occurs in both ears we can get a significant loss that can interfere with communication and social interaction.