Decomposers

Decomposers or detrivores are a group of organisms consisitng of small animals like worms ,insects,bacteria and funfi,which break down dead organic meterial in to smller particles and finally in to simplet substances that are used by plants us nutrition.Thus,decomposition is a vital function in nature,as without this,all the nutrients would be tied up in dead matter and no new life would be produced.
Most ecosystems are highly complex and consist of an extremely large number of individuals of a wide variety of species .In the species-rich tropical ecosystems(such as in our country),only a few species are very common, while most species have relatively few individuals .some species of plants and animals are extremely rare and may occur only at a few locations .These are said to be 'endemic'to these areas.
when human activities alter the balance in these ecosystems,such pertubations often lead to the disappearence of some uncommon species when this happens to an enademic species that is not widly distributed ,it beocnmes extinct forever.