Eli5: What’s the biological reason behind humans having eyes(irises) of different color?

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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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Anonymous 0 Comments

Evolution doesn’t work like that. Survival of the fittest applies here. If it either improves or doesn’t hinder our ability to survive until we have kids, it continues to exist down the line. It exists only because it didn’t manage to harm our survival.

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