The answer is(c) ecosystem
The term ecosystem defines a large community of living organisms that includes plants, animals and microbes in a particular geographical area.The organisms are linked to the various kinds of nutrients cycle and energy flow in the system. The ecosystem is independent of size but is restricted to a particular place only. The members of ecosystem belongs to the same community. There are two types of ecosystem : Aquatic ecosystem (marine, large marine, freshwater, lake, river, wetland. Terrestrial Ecosystem (forest, greater yellowstone, forest, desert).