The external ear conducts sound waves through the air; the middle ear, through bone; and the inner ear, through fluid. true false

True. The external air is empty until the ear drum, passing through into the middle ear by way of three small bones that vibrate against each other and into the inner ear, where sound vibrates through the bony labyrinth, all encased in a fluid that helps the sound move to sound detecting nerves in the inner ear.

Icant be totally sure but i would say with confidence that it is example #1 about cells.