The document discusses puberty and the physical, psychological, and emotional changes that occur during this stage of development. Puberty begins with the activation of the hypothalamus and pituitary glands which stimulate the production of hormones like estrogen, progesterone, and testosterone. These hormonal changes cause secondary sex characteristics to develop and trigger the ability to reproduce. In addition to physical transformations, puberty involves cognitive, emotional, and social changes as adolescents transition towards adulthood.

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