physical change physical change period of fastest physical change in life physical change physical change adolescence physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change The Growing Child: Adolescent (13 to 18 Years) physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change physical change