Answer:
The Bacteria from the 5 kingdom system is divided in two domain in six-kingdom system, these two domains separate all prokaryotic organisms (bacteria) into two new groups: The Archaea bacteria, and Eubacteria or true bacteria.
The archaebacteria are thought to be ancient but live in very extreme habitats such as high or low pH, high temperatures and anaerobic habitat as well where as the eubacteria are more representative of what bacteria is known for. The Archaea domain have cell walls that are different from the Bacteria as their walls do not contain peptidoglycan.