Puberty is defined as the production of hormones in the reproductive glands stimulated by the pituitary gland the stage of identity versus role confusion the physical changes that occur in the body as sexual development is stimulated by hormonal changes the time when a child becomes a teenager

The answer is the physical changes that occur in the body as sexual development is stimulated by hormonal changes. The hormonal signals are produced by the brain to the gonads: the ovaries in a girl, the testes in a boy. In response, the gonads produce hormones that stimulate libido and the growth, and the respective physical characteristics associated with either sex.

The zone your looking for is the intertidal zone.