Only super smart scientists know why not a 11 year old girl. It is probably because one day something created the first human and said wow I want people to have weird mood swings and have hormones and stuff and then it happened. I think everyone is weird in there own way and one way is we all have hormones. But other than that idk.
Most transgender people who undergo transition use hormones.
Gay people do not inject hormones. (Maybe you are thinking of transgender people).
not most people
Hormones are chemicals in the body that do all sorts of things for you. They regulate growth, reproductive systems, metabolism and more! When people think of hormones, they think of sexual hormones...but there are LOTS of different types of hormones that are constantly moving around your body! That dose not answer the question^
Hormones cause growth in people. Teenagers act stupidly because of their hormones.
Sexual hormones.
Sexual hormones.
Can't help it, hormones make people feel weird things.
The act of smiling does not cause the body to secrete hormones. The reason that made a person smile may do so.
Hormones. Taking Human Growth Hormones or Steroids can cause extra unwanted hair growth.
Because they don't need any hormones. Being gay has nothing to do with hormones (other than the fact that sexual orientation may be related to pre-natal hormones).
It is called Hormones