organism - a living thing, biotic factor - a living or once living part of an organism's habitat, abiotic factor - a nonliving part of an organism's habitat, population - ALL of the members of one species living in the same area, community - all of the DIFFERENT populations that live together in a certain area, ecosystem - the community of organisms that live in a particular area; along with their nonliving environment, limiting factor - an environmental factor that causes a population to decrease in size,

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