Final answer:
Developmental psychologists focus on the changes in physical, cognitive, and psychosocial aspects throughout a person's lifespan, considering factors like nature versus nurture and the continuity of development.
Step-by-step explanation:
Developmental psychologists are especially concerned with changes that occur throughout the life span. This includes studying how humans change and grow from conception through childhood, adolescence, adulthood, and death, encompassing all three developmental domains: physical development, cognitive development, and psychosocial development. By examining these areas, developmental psychologists aim to understand patterns of change and the factors that influence these patterns, including nature versus nurture, and whether development is continuous or discontinuous.