The process by which organic substances are broken down into simple organic matter is known as decomposition.
Bodies of all living organisms begin to decompose shortly after death. It is essential for recycling the finite matter through the nutrient cycle. Bacteria and fungi carry out the process of decomposition.
These decomposers extract many of the useful substances for their own benefit and in the process help in the rotting down of the dead organic material. Those chemicals that are left back get dissolved in the soil and serve as nutrients for living beings like germinating seedlings.
Decomposition limits the competition of resources and provides a fresh source of essential nutrients for new generations of life.