2) In girls, oestrogen and progesterone is produced, and these cause the secondary characteristics. In boys, testes produces testosterone which begins the development of secondary sexual characteristics.
4) FSH: Stimulates the follicles tp produce eggs.
LH: In males it produces testosterone and in females it triggers ovulation.
Oestrogen: Begins body changes during puberty.
Progesterone: It maintains preganancy and helps sustaining it.
Oxytocine: It has a crucial role in the childbirth process and also helps with male reproduction.
Hcg: It maintains the lining of the uterus
Prolactine: It makes women produce milk when they are pregnant
Testosterone: is produced by the ovaries and helps to regulate energy and mental state.
5) a) The most common at which boys undergo the changes of puberty is when they are 12 years old.
b) Yes, because menstruation starts when you are between 10 and 15 years old.
c) The first menstrual perios (between 10 and 15 years old), testes enlargement and pubic hair both between 10 and 14 years old.