Though the options from which we can choose to answer are not included in your question, I can infer that you are referring to the classification of living and non-living aspects of an ecosystem.
Ecosystems can be classified in many ways according to their organizational levels. Some of these classifications span between 3 and 7 distinct levels. The only commonly used two-level classification system of organization within an ecosystem is to group the contents of the ecosystem by:
One possible comparison to be drawn between the members of these groups is to compare the rate of change over time. We can compare the relatively fast rate at which the living members of an ecosystem change in comparison to the rate at which the environment itself undergoes changes, which is a much slower process.
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