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the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
the relation between two different kinds of organisms when one receives benefits from the other without damaging it
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
a system formed by the interaction of a community of organisms with their physical environment
(ecology) the status of an organism within its environment and community (affecting its survival as a species)
the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)
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