Adolescence

Part I of Essay
is the developmental stage between childhood and adulthood; it generally refers to a period ranging from age 12 or 13 through age 19 or 21. Although its beginning is often balanced with the beginning of puberty, is characterized by psychological and social stages as well ....

Part II of Essay
.... or mental development; identity, or personality formation; and parent-adolescent relations. Physiological Change: Between the ages of 9 and 15, almost all young people undergo a rapid series of physiological changes, known as the adolescent growth spurt. These hormonal changes include an acceleration in the body's growth rate; the development of pubic hair; the appearance of axillary, or armpit, hair about two years later. There are changes in the structure and functioning of the reproductive organs; the mammary glands in girls; a ....