![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | See also Evolution; Natural selection; Reproduction; Sexual selection.
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | adolescence and adulthood, 1519
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | age and levels of, 7980, 80 , 99
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | amount produced in body, 8
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | animal experiments with, 6869
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | cellular activity and, 10
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Class III controlled substance, 87
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | detecting presence of, 78
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | discovery, historic, 214
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | environmental and phytochemical, 1819
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | estrogen created from, 89, 10
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | evolution and levels of, 3536
|
![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | fetus and, 1115, 25, 121
|
|