Habitat - The place where an organism lives - the physical part of an ecosystem, Population - All the organisms of ONE species living and interbreeding in a habitat at the same time, Community - All the populations of the different species living in the same ecosystem, Abiotic Factors - Non living or physical / chemical factors that affect a population size, Biotic Factors - Living factors that affect a population size e.g. predation, disease, Ecosystem - A unit which consists of more than one habitat and their associated communities,

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