What do the tympanic membranes do for the frog?

A tympanic membrane, (is also called a tympanum), is the circular patch of skin directly behind the frog’s eye that we commonly call an eardrum. It functions much like our’s does.

The tympanum sends sound waves to the middle of the war then to inner ear, which allows a frog to hear both in the air and below water.

The answer is c) tons