(a)[4]
Describe what each of the following hormones does in the menstrual cycle: FSH progesterone
(b(i))[2]
Suggest why pregnancy may occur if sexual intercourse takes place several days before ovulation.
(b(ii))[3]
Name the method of birth control that uses the information in a chart like this. Explain how this method of birth control is used to prevent pregnancy.
(b(iii))[1]
Suggest why the birth control method you named in (b)(ii) is regarded as unreliable.