Question

define iris?? in science​

Answer 1

Answer:

HEY MATE,

HERE'S YOUR ANSWER

=> In humans and most mammals and birds, the iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.

Eye color is defined by that of the iris.

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Answer 2

Answer:

Iris is the circular coloured certain of eye.The opening form the iris is pupils.It helps to regulate the ammount of light that enters the eye.