At Key Stage 3 (age 11 to 13 +, Years 7 to 9) schools have to teach: that fertilisation in humans and flowering plants is the fusion of a
male and a female cell; about the physical and emotional changes that take place during adolescence; about the human reproductive system, including the menstrual cycle and fertilization; how the
foetus develops in the uterus, including the role of the placenta.