Here's why:
* Community: A community is a group of interacting populations of different species that live in the same area. It focuses on the variety of living things in a specific place.
* Population: A population is a group of individuals of the same species living in the same area.
* Ecosystem: An ecosystem is a community of organisms and their physical environment interacting as a functional unit. It considers both the living organisms and the non-living components of their environment.
So, while an ecosystem includes all the living and non-living things, a community focuses specifically on the different species present.