Need !
sound waves travel down the ear canal and strike the causing it to vibrate and to pass the vibrations on to small bones in the middle ear.

(a)eardrum
(b)anvil
(c)stirrup
(d)cochlea

A. Eardrum

Explanation: Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.