Examlex
One function of the plant cuticle is to increase water uptake by roots.
Iris
The colored part of the eye that controls the size of the pupil and the amount of light reaching the retina.
Colored Part
The iris, the circular structure in the eye responsible for controlling the diameter and size of the pupils and thus the amount of light reaching the retina.
Pupil Size
The diameter of the circular opening in the center of the iris of the eye, which can vary in response to light exposure or emotional state.
Trichromatic Theory
Theory stating that color perception is produced by three types of cone receptors in the retina that are particularly sensitive to different, but overlapping, ranges of wavelengths.
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