Part 1 of Essay
The ear is the organ of hearing and balance in vertebrates. The ear converts sound waves in the air, to nerve impulses which are sent to the brain, where the brain interprets them as sounds instead of vibrations. The innermost part of the ear maintains equilibrium or balance. The vestibular apparatus contains semicircul ....

Part 2 of Essay
.... which are enclosed in a fluid filled chamber called the cochlea. The outer and middle ears purposes are only to receive and amplify sound. Those parts ofd the ear are only present in amphibians and mammals, but the inner ear is present in all vertebrates. The ear can hear in several different ways. They are volume, pitch, and tone. Pitch is related to the frequency of the sound wave. The volume depends on the amplitude or intensity of the sound wave. The greater the frequency, the higher the pitch. Hu ....