At puberty, the hypothalamus secretes gonadotropin-releasing hormones (GnRH), causing the secretion of gonadotropins by the pituitary gland. These hormones cause the ovaries to produce estrogen and testes to produce testosterone. As the levels of these hormones rise, they shut down the release of GnRH and the gonadotropins. This example illustrates the

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

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explanation:

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the cell cycle is the final answer! : )