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Ecology the study of abiotic and biotic things interacting with eachother Coevolution long term change that happens between two spiecies because of close interaction commensalism only one spiecies benifits and the other is not affected mutualism when both spiecies benifits Symbiosis a close long term association between two or more spiecies Competition when two or more individuals or populations need the same food source, shelter, or space Carrying compacity the largest population an area can support food web a diagram that shows the feeding relationships between organisms food chain a diagram that shows how energy flows from one organism to the next energy pyramid Triangular diagram shows the loss of energy that goes up the pyramid limiting factor resource so scarce limits the size of a population