Briefly explain the following:
a. vision
b. hearing
c. equilibrium

Vision : In simple words vision can be defined as the act of seeing. Basic components responsible for the vision function are eye, visual center in the brain, and the optic nerve, which connects eye and brain.

Hearing : Hearing can be defined as the ability of an individual to interpret sounds by analyzing vibrations or changes in the pressure of the surrounding medium with respect to time. The body organ which performs the function of hearing is "ear".

Equilibrium : Equilibrium can be defined as the static condition in which all affecting factors are balanced by cancelling out equal opposing forces that results in a stable system.

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