The correctly paired ecological level with its description is the option D. Ecosystem - all of the living and nonliving factors in an environment, among given options.
An ecosystem is a geographic region or area where all the living factors including animals, plants, bacteria, and others interact with all the physical or non-living factors such as landscape, humidity, water, and many more.
Other given ecological level and their description:
- Organism - an organism is the living being that is the simplest form of ecological level composed of organ systems.
- Community - It is a population with similar characteristics that live in a particular area.
- Population - a group of members of a particular species living and interbreeding within a given area.
- Organisms > Population > community > ecosystem
Thus, the correct answer would be option D.
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