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close relationship between two or more species that live together (commensalism, mutualism, or parasitism)
symbiotic relationship where one organism benefits and the other organism is not helped or harmed
an organism that cannot produce its own food and must take in energy by eating other living things
organism that that decomposes organic material and returns the nutrients to the soil, air, and water
environmental factor that depends on the number of members in an population (disease, competition, etc.)
environmental factor that does not depend on the number of individuals in the population (weather, etc.)
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