The levels of organization used by ecologists is population -> community -> ecosystem.
An ecosystem is made up of both living and non-living elements of the environment (all populations of living things). A region's biotic and abiotic elements come together to form an ecosystem.
Ecology is the study of how biotic and abiotic forces interact. Any organism's niche is determined by how it responds and behaves in response to the distribution and abundance of abiotic stimuli.
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