 | Estrogen, 8, 9
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 | body fat and, 15
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 | environmental, 12, 1819
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 | female fetus and, 25
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 | high levels in animals, 9
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 | high levels in human males, 9
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 | levels across the lifespan, 1516, 16
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 | plant sources, 18
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 | produced from testosterone, 89, 10
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 | sexual selection and, 30
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 | Evolution, 2527
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 | adaptive features of humans and, 2829
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 | ants, 28
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 | coevolution and truce between the sexes, 3538
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