Original sentence: Depending on the amount of light, the iris makes the pupil larger or smaller.The iris can be green, blue, or brown
Edited sentence: "Eye color" is the color of the iris, which can be green, blue, or brown.In response to the amount of light entering the eye, muscles attached to the iris expand or contract the aperture at the center of the iris, known as the pupil.The larger the pupil, the more light can enter