What role do decomposers play in primary and secondary succession?

Decomposers separate dead living beings and reuse the usable, natural mixes once more into the dirt. 
The volume of water diminishes amid sea-going progression in light of the fact that after some time, silt conveyed by the water store at the base of the water and develop. Dead creatures break down and add to the dirt. More soil gathers after some time and in the long run, there is no water left.