An ecosystem can be defined as a group of living organisms and all abiotic factor that interacts in a given environment. Humans can affect the ecosystem by altering environmental factors or by removing or adding new species.
An ecosystem is bigger than the community because the ecosystem consists of community and environmental factors that impact on the environmental factors. On the other hand, a community is a group of plants and animals that are found in a particular area. The number of species of animals and plants presents strongly affects the community. A community is smaller than the ecosystem because it is concerned with an only living organism, and it excludes abiotic factors. The community is only affected by biotic factors such as predation and competition.