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Adolescent development medlineplus medical encyclopedia electricity and circuits class 6 cbse

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• Menarche (the beginning of menstrual periods) typically occurs about 2 years after early breast and pubic hair appear. It may occur as early as age 9, or as late as age 16. The average age of menstruation in the United States is about 12 years. • Boys do not start puberty with a sudden

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