Which concept describes the role and position of a species within an ecosystem, including its use of resources and impact on others?

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The idea being tested is the ecological niche. The niche describes the role a species plays in an ecosystem—the resources it uses, how it obtains those resources, its behaviors, and how it interacts with other organisms and the environment. It captures where a species fits in the community and how it affects and is affected by other species, including competition, predation, and symbiotic relationships. Understanding niches helps explain why multiple species can coexist in the same area by dividing resources or using different strategies or times. By contrast, ecology is the broad study of how organisms interact with each other and their environment, habitat is the specific physical place where an organism lives, and endemic refers to a species that is native to and restricted to a particular geographic area. Therefore, the description given points to the ecological niche.