an ecosystem is a determined,self-supporting system of organisms interacting after that each auxiliary and subsequent to a brute setting.an ecosystem can be little,such as a pond,such as a mangrove swamp or a large reforest.

The components of ecosystems
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Whatever their size,ecosystems usually have the same components:

> producers - natural world which photo synthesise to manufacture food

> consumers - animals that eat nature or added animals

> decomposers - decay dead material and encourage to recycle nutrients

> a monster atmosphere - the quantity get your hands on of the non-biological components of the 
  ecosystem; for example, the water and soil in a pond or the soil and heavens in a tree-forest.


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(source)  https://www.google.com/search?q=ecosystems.&rlz=1C1GCEA_enBD762BD762&source