Final answer:
The correct answer is symbiosis, a close and prolonged interaction between two different species with mutual benefits.
Step-by-step explanation:
The correct answer is symbiosis. Symbiosis refers to a close and prolonged interaction between two different species. One species lives in or on the other, and both species benefit from this relationship. Examples of symbiotic relationships include mutualism, where both species benefit, and parasitism, where one species benefits while the other is harmed.
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