What do the polar bears, reindeer, and shrubs that live in a single area make up?

A combination of different organisms living within a single area is called an ecosystem. It is also sometimes described as the complex relationship between all the components both living and non-living within a given area. Although there may be a great degree of biodiversity within an ecosystem, all components within an ecosystem depend on each other for one resource or another.A sustainable ecosystem is where there is a healthy balance of all components making up the ecosystem.