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| A group of organisms of the same species that live in a specific geographical area. |
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| The largest population that an environment can support at any given time. |
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| An interaction between two organisms in which one organism , the predator , kills and feeds on the other organism , the prey. |
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| The evolution of two or more species that is due to mutual influence , often in a way that makes the relationship more mutually beneficial. |
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| A relationship between two species in which one species, the parasite , benefits from the other species , the host , which is harmed. |
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| A relationship in which two different organisms live in close association with each other. |
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| A relationship between two species in which both species benefit. |
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| A relationship between two organisms in which one organism benefits and the other is unaffected. |
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| The unique position occupied by a species , both in terms of its physical use of its habitat and its function within an ecological community. |
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| The largest ecological niche where an organism or species can live without competition. |
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| The range of resources that a species uses , the conditions that the species can tolerate , and the functional roles that the species plays as a result of competition in the species' fundamental niche. |
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| The exclusion of one species by another due to competition. |
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| A species that is critical to the functioning of the ecosystem in which it lives because it affects the survival and abundance of many other species in its community. |
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