Examlex
Cis and trans isomers are constitutional isomers that differ in the location of a C=C bond.
Eye
An organ of vision that detects light and converts it into electro-chemical impulses in neurons.
Circular Opening
An opening or hole that is round in shape.
Iris
The colored part of the eye that controls the diameter and size of the pupil, thus regulating the amount of light that enters the eye.
Pupil
The opening in the center of the iris of the eye that adjusts size to control the amount of light reaching the retina.
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