Decomposers are the organisms that cause the breaking down of dead and decaying organic matter which includes dead plants and animals.
Kingdom Fungi and monera are two kingdoms that includes decomposers.
Kingdom Fungi: Ascomycetes – They are also called sac fungi. They can be coprophilous, decomposers, parasitic or saprophytic. The sexual spores are called ascospores. Asexual reproduction occurs by conidiospores. Example – Saccharomyces.
Kingdom Monera: Members of monera are also decomposers.