Why do we grow beards as adults?
When men grow up, they grow beards. However, when they grow up, not only do they grow beards, but also armpit hair, shin hair, chest hair, etc., which used to be fine, downy hair, become thicker and longer.
There are many other changes that occur as a result of growing up. For example, the body gains muscles and bones become thicker. Shoulders become wider, and the voice changes.
All of these changes are caused by sex hormones. When a child becomes an adult, sex hormones suddenly increase. This sex hormone causes the growth of beards. The sex hormones that make men manly are called male hormones.
Similarly, there are of course hormones that make women feminine. These are called female hormones.
It is the function of female hormones that cause a woman's breasts to swell, her pelvis to develop, and her entire body to become more rounded.
From upper elementary school to junior high school, male hormones are secreted in males and female hormones in females. As a result, the body gradually becomes more masculine and feminine.
