What are decomposers? What will be the consequence of their absence in an ecosystem?

(N/A) Decomposers are microorganisms,such as bacteria and fungi,that break down complex organic matter from dead plants and animals into simpler inorganic substances.
These inorganic substances are released into the soil and are reused by plants for growth.
In the absence of decomposers,the recycling of nutrients in the biosphere would stop.
Dead organic matter would accumulate,leading to the depletion of essential nutrients in the soil and the eventual collapse of the ecosystem.