Human science, population, community, ecosystem, and biosphere are all subfields of ecology. Ecology studies living things, their environments, and the relationships between living things and their surroundings. Many different scales of analysis are used, including the individual, the population, the community, the biosphere, and the ecosystem. An ecologist's work is driven by a desire to learn more about how organisms function, how they adapt to their environments, how they interact with one another, and how diverse their species are. Conservation biology, wetland management, natural resource management (agroecology, agriculture, forestry, agroforestry, fisheries), urban planning (urban ecology), community health, economics, basic and applied science, and human social interaction are all fields in which ecological principles have found useful applications (human ecology).

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