Examlex
Rods
are photoreceptor cells in the retina of the eye that are responsible for vision at low light levels.
Total Color Blindness
A rare condition where an individual cannot perceive any color, only shades of grey.
Genetic Variation
The diversity in gene frequencies within a population, which contributes to the population's ability to adapt to varying environments.
Observer
A person who watches or notices something without directly participating.
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