Answer:
1. testosterone, estrogen, and thyroid hormone.
2. Menstruation is when a women's body produces an egg at their time of the month - when the egg is not fertilized by a sperm, a woman menstruates. If an egg is fertilized, that is the beginning of a baby.
3. Some challenges are:
a. hormones affecting your mood and how you feel about yourself
b. change in voice, hight, weight, etc
c. change in friends during this time can also be hard, because as time goes on you will look and act different, and they will too!
Step-by-step explanation:
Hope this helps (: