Based on observations made by researchers, what mechanism typically activates the chain of sexual development in children during puberty?

Question

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Based on observations made by researchers, the mechanism that typically activates the chain of sexual development in children during puberty is an increase in the levels of hormones, specifically gonadotropin-releasing hormone (GnRH), follicle-stimulating hormone (FSH), and luteinizing hormone (LH). This hormonal surge triggers the development of sexual characteristics and the onset of menstruation in girls and sperm production in boys. The influence of societal values and exposure to the media may affect sexual development indirectly but are not the primary mechanisms that activate the chain of sexual development during puberty. The development of muscles is also not directly related to the onset of puberty.

Based on Observations Made by Researchers, What Mechanism Typically Activates