Puberty is triggered by hormones. In girls, the main hormones are estrogen and progesterone. In boys, the main hormone is testosterone. These chemicals signal the body to grow and change.
Prior to the early 1990s, sex education was frequently segregated by gender and focused strictly on the mechanics of reproduction. The 1991 curriculum shifted this paradigm. For the first time, educators brought boys and girls together into the same classroom to discuss topics that were previously considered taboo. Puberty is triggered by hormones