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Ecology is the study of how living things interact with each other and their environment. This includes living things (biotic factors) and nonliving things (abiotic factors).

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Ecology on Khan Academy: Why are polar bears found only in the Arctic? Why does mildew grow in your shower and not (hopefully) in your sock drawer? Learn how ecologists study the interactions between organisms and their environment, and how these interactions affect where, and in what numbers, different types of organisms are found.

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