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all the organisms that live in an area together with the nonliving things in the environment.
a group of organisms that can mate and produce offspring that in turn can produce more offspring.
structure, behavior, or other trait in an organism that helps it to survive in its environment.
a type of symbiosis in which one species benefits while the other seems to be unaffected.
a type of symbiosis that occurs when an organism called a parasite feeds on the cells, tissues, or fluids of another organism call a host.
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