Ecology
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Ecology is the branch of science that studies the distribution and abundance of living organisms, and the interactions between organisms and their environment. The environment of an organism includes both its physical habitat, which can be described as the sum of local abiotic factors like climate and geology, as well as the other organisms which share its habitat. The term oekologie was coined in 1866 by the German biologist, Ernst Haeckel, from the Greek oikos meaning "household" and logos meaning "science"; hence, the "study of the household of nature."