Which associated with after is just a sex characteristic that is primary?

Which associated with after is just a sex characteristic that is primary? Note: Figure figures make reference to Sadler, 9th version. Figures in tenth version are one chapter more complex. For instance, Fig. 1.13 in the edition that is 9th Fig. 2.13 in the 10th. 1. To explain the growth of this gonads in men […]