Changes caused by oestrogen: Breasts develop, Fat deposited on hips, buttocks and thighs, Mature ova start to form every month in the ovaries, Uterus grows, Menstruation begins, Changes experienced by everyone: Growth spurt, Underarm hair grows, Pubic hair grows, Brain starts to mature, Changes caused by testosterone: Facial hair grows, Larynx enlarges and voice breaks, Testes grow, Produce sperm throughout lifetime, Shoulders and chest broaden as muscles develop,

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