The Parts of Ecosystems Plants originate, live, and die in communities consisting of plants and a variety of other organisms, large and small. All the living constituents make up the biota (or the biotic component) of the community. The nonliving, physical factors (such as temperature, light, and nutrients) that affect the life of organisms—and determine to a large extent the kinds of organisms present—collectively represent the abiotic factors of the community. The environment is the total of all the biotic and abiotic forces in which an organism or a community of organisms lives. The biotic components and abiotic portions of the environment are inseparably intertwined and constantly exchange materials; there are inputs (materials or organisms entering) and outputs (materials or organisms leaving) to the community; energy flows one way through
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.