Examlex
Mr.Smith uses a token economy system in his history class.Whenever Bill breaks a rule,he lose a "chip." If the infraction is major,Bill loses several chips.This is an example of
Pupil
The central, circular opening in the iris of the eye, which regulates the amount of light that enters the eye to reach the retina.
Iris
The colored part of the eye surrounding the pupil, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
Visible Light Waves
Electromagnetic waves that are visible to the human eye, which perceive them as colors.
Pupil
The adjustable opening in the center of the eye that allows varying amounts of light to enter.
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