Natural blonde hair is a rare trait found in approximately 2% of adults globally. Evolutionary biologists explain this phenomenon through a combination of factors including sunlight exposure, genetic predispositions, and the tendency for hair color to darken with age. Interestingly, the trait of blondness has evolved independently in at least two distinct human populations. AI
RANK_REASON The item is an explanation from an expert on a biological phenomenon, not a new release or significant industry event.
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