Dr Rana Hamza Shakil thank you for your contribution to the discussion

Fungi and bacteria are essential to many basic ecosystem processes. Some types of fungi and bacteria can break down fallen wood and litter returning nutrients to the soil. Other types can fix nitrogen in the soil and help plants get nutrients from the soil. Decomposers [Bacteria and fungi] are the waste managers of any ecosystem. They are the final link in a food web breaking down dead organic matter from producers and consumers and ultimately returning energy to the atmosphere in respiration and inorganic molecules back to the soil during decomposition. Microorganisms help in cleaning up the environment. They decompose dead and decaying matter from plants and animals; convert them into simpler substances which are later used up by other plants and animals. Thus, they are used to breakdown harmful substances. Bacteria and fungi are called decomposer because they break down the dead and decaying organic matter into a simpler substance. It provides the nutrients back to the soil. Bacteria and fungi are called decomposers because they break down the dead and decaying organic matter into simpler substances such as carbon dioxide, water, simple sugars, and mineral salts and provide the nutrients back to the soil.