 | See also Evolution; Natural selection; Reproduction; Sexual selection.
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 | adolescence and adulthood, 1519
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 | age and levels of, 7980, 80 , 99
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 | amount produced in body, 8
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 | animal experiments with, 6869
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 | cellular activity and, 10
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 | Class III controlled substance, 87
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 | detecting presence of, 78
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 | discovery, historic, 214
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 | environmental and phytochemical, 1819
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 | estrogen created from, 89, 10
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 | evolution and levels of, 3536
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 | fetus and, 1115, 25, 121
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