Human Breast Evolution Mystery

Scientists still do not have one agreed explanation for why human females evolved permanently enlarged breasts after puberty, unlike most other primates. Modern reviews describe the idea as an unresolved evolutionary puzzle and note that many older explanations, including simple fat storage or infant-gripping theories, remain speculative rather than settled. Researchers have proposed competing ideas involving sexual selection, by-products of shifts in body fat distribution, and other coincident evolutionary changes, but no single theory has won broad agreement.

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