Archaebacteria are mainly found in harsh environments such as hot springs, salty, and marshy regions. For example, Halobacterium and Methanosaeta.
Decomposition is a process of breaking down complex organic matter into inorganic compounds. The organisms that help in decomposition are called decomposers.
All archaebacteria are decomposers. They help in breaking down sewage that is present in wastewater treatment plants.