In addition to differentiation by species, zoology also encompasses other types of research, such as animal physiology, behavioral ecology, evolutionary biology and ethology, the study of animal behavior.
Public health is personal. Public health professionals focus on preventing disease and injury by promoting healthy lifestyles. They implement educational programs, develop policies, administer services, conduct research, and regulate health systems to achieve these goals.
Public health nursing (PHN) practice is population-focused and requires unique knowledge, competencies, and skills. Early public health nursing roles extended beyond sick care to encompass advocacy, community organizing, health education, and political and social reform.