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Ecology

ecology study of all the interactions among organisms and their environment
abiotic factor any nonliving part of the environment,such as water,sunlight
biotic factor any living or once living organism in the environment
population all of the individuals of one species that live in the same space at the same time
ecosystem all of the communities in a given area and the abiotic factors that affect them
biosphere part of earth that supports life
population density number of individuals in a population that occupies an area of limited size
habitat place where an organism lives
symbiosis any close interaction among two or more different species
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