Armpit hair's evolutionary purpose linked to scent communication

Human armpit hair, which appears at puberty, serves a biological purpose related to apocrine glands. These glands secrete an oily substance that bacteria on the hair break down into odor compounds. The hair facilitates the evaporation of these compounds, aiding in chemical communication about health and hormonal state, rather than being a vestigial trait. AI

RANK_REASON The item discusses a biological and evolutionary explanation for a human trait, citing scientific reviews and studies. [lever_c_demoted from research: ic=1 ai=0.1]

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