I know that eye color is directly related to the amount of melanin present in the front layers of the iris. But what’s the biological need behind different color?
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It IS biological to be suited to region and climate. Well darker skin color deflects large amount of sunlight so more suited to warmer climate just like dark eyes deflect more sunlight so they can see in the bright day. Lighter eyes absorb the sunlight because there isn’t as much just like with lighter skin to absorb as much as possible because in colder climates vitamin D is more scarce. It IS biological.
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