(a(i))[1]
With reference to Fig. 6.1, Explain why LH rises sharply at around day $12$.
(a(ii))[1]
State how Fig. 6.1 indicates that the woman did not become pregnant during this cycle.
(b(i))[4]
Explain how this combined contraceptive pill prevents pregnancy.
(b(ii))[1]
Suggest why some women take the combined contraceptive pill only during the first $21$ days of their cycles.
(b(iii))[1]
Some women have a contraceptive device placed under the skin. It releases hormones into the blood and may remain effective for up to three years. Suggest one advantage of using such a device instead of contraceptive pills.