Final answer:
An ecosystem consists of all the living things in a particular area together with the abiotic, non-living parts of that environment. It is a broader concept that includes populations, communities, and the physical environment.
Step-by-step explanation:
An ecosystem is the correct answer. An ecosystem consists of all the living things in a particular area together with the abiotic, non-living parts of that environment such as nitrogen in the soil or rainwater. It is a broader concept that includes populations, communities, and the physical environment. For example, in a park, all the plant and animal species make up an ecosystem.