Dear student,
Decomposers are the organisms that consume dead organisms and break them down into simple chemical components like carbon, nitrogen and other nutrients which are essential for living organisms. By eating up the dead matters they clean the environment. Without decomposers the world would have filled with dead bodies of plants and animals. Therefore, decomposers are called nature's cleansers.
Decomposers include microorganisms such as bacteria and fungi, which obtain nutrients by breaking down the remains of dead plants and animals. Decomposers eventually convert all the organic matter into carbon dioxide (which they respire) and nutrients. These nutrients (such as nitrogen, phosphorus, and magnesium)are then taken up by the plants and algae in the forest. This process resupplies the nutrients to the ecosystem and also converts the waste matter back to usable form.
Regards