Population - A summation of all the organisms of the same group or species, which live in a particular geographical area, Community - an assemblage or association of populations of two or more different species occupying the same geographical area and in a particular time., Habitat - the natural home or environment of an animal, plant, or other organism., Ecosystem - a community of living (biotic) and nonliving (abiotic) components of an environment interacting as a system., Trophic level - the position that an organism occupies in a food chain , Producers - organisms in an ecosystem that produce biomass from inorganic compounds (autotrophs). In almost all cases these are photosynthetic organisms.,

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