The document outlines the roles of various disciplines in public health, including epidemiology, biostatistics, health policy and management, environmental health science, and social and behavioral sciences. Epidemiology studies disease distributions and determinants at the population level. Biostatistics applies mathematical and statistical methods to public health problems and data analysis. Health policy and management focuses on healthcare delivery, quality, costs, and policy from an administrative perspective. Environmental health science examines the impact of environmental factors on population health. Social and behavioral sciences consider physical, social, and cultural influences on individual and community well-being.