Problem: Give me an in-text citation: Human development is a lifelong process that encompasses the physical, cognitive, and psychosocial dimensions of growth. Each of these three domains plays a distinct yet interrelated role in shaping individuals from infancy through old age. Physical Development Physical development involves the biological changes in the body and brain throughout the lifespan. In infancy, this domain is characterized by rapid growth, where babies typically triple their birth weight in the first year and develop basic motor skills, such as crawling and walking. As children grow, they experience significant changes, including the development of coordination and strength. During adolescence, puberty initiates profound physical transformations, including hormonal changes that lead to growth spurts, sexual maturation, and the development of secondary sexual characteristics. In adulthood, physical development may involve maintaining health, exploring fitness, and adapting to aging, such as declining muscle mass and bone density in later years. Need Assignment Help?