Unformatted text preview: infant to turn its head toward a touch. During the first year the infant passes through a series of developmental stages. Childhood begins at two and lasts until puberty. Physical growth is accompanied by increasing development of motor and language skills. Play, make-believe, and increases in memory and attention span also occur. Adolescence and Adulthood Growth accelerates during puberty. Boys increase in height by 3-5 inches per year, girls 2-4 inches. The heart doubles in size, and hormones stimulate sexual maturity. Growth ends during the end of adolescence, and aging starts during the late twenties. Life expectancy (47 and 50 years for males and females in 1900; 74 and 81 in 1996) has increased....
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