Theconverts sound waves into electrochemical impulses which are transmitted to the brain.

Ear

Explanation:

Hearing is a series of events in which the ear converts sound waves into electrical signals and causes nerve impulses to be sent to the brain where they are interpreted as sound. The ear has three main parts: the outer, middle, and inner ear.

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which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.