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Ecology

ecology (a branch of biology), or ecological science, is the study of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment. It studies how organisms (e.g. Plants and animals) interact with each other and their physical environment (e.g. climate and geology).

2 the branch of sociology that deals with the relations between human beings and their environments.

The term was coined in 1866 by german biologist Ernst Haeckel from the greek oikos meaning "house" and logos meaning "science".