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The role or position that an organism has in its environment.
A niche may be described in terms of requirements for living space, temperature, moisture or in terms of appropriate mating or reproduction.
The relationship between two or more organisms that live closely together and benefit from each other.
Is a relationship in which one organism benefits and the other organism is neither helped nor harmed.
A symbiotic relationship in which one organism benefits at the expense of another organism.
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