The study of energy and matter cycles in an ecosystem.

Boston University

Georgetown University

Ecology is a scientific discipline that focuses on interactions of living things in relation to their environment, and encourages understanding of the environment as our home.

Ecology

An ecosystem describes the interactions between groups of organisms from all biological domains and nonliving things in a shared geographical space.

Ecosystem

Principles of Epidemiology. (n.d.). United States Center for Disease Control. Retrieved July 19, 2020, from https://www.cdc.gov/csels/dsepd/ss1978/lesson6/section2.html

Principles of Epidemiology

Population Ecology deals with the dynamics of the species population, how these populations interact with their surroundings, and how they change over time and space.

Population Ecology

Populations of a number of species aggregate either because they have the same habitat requirements or because they are developing at the same rate are affected by the same things/

Community Ecology

Ecosystem Ecology

All life on Earth (the sum of all ecosystems on earth)

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