(A) The $Pupil$ is a circular aperture in the center of the $Iris$. The $Iris$ contains muscles that contract or relax to change the size of the $Pupi

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(A) The $Pupil$ is a circular aperture in the center of the $Iris$. The $Iris$ contains muscles that contract or relax to change the size of the $Pupil$,thereby regulating the amount of light that enters the eye. When light intensity is high,the $Pupil$ constricts,and when light intensity is low,the $Pupil$ dilates.