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