(a(i))[1]
State the age at which first menstruation most commonly occurred.
(a(ii))[1]
State how many females had their first menstruation at the age of 15.
(b)[2]
Describe what happens to the uterus lining during a normal menstrual cycle in: days 1 to 5 days 8 to 14
(c)[1]
Describe what occurs in the ovary on day 14 in a typical menstrual cycle.
(d)[1]
State the hormone responsible for the development of secondary sexual characteristics in boys.
(e)[2]
State two physical changes that happen in males and in females during puberty.