However, it's important to note that the traditional five-kingdom classification system (Animalia, Plantae, Fungi, Protista, and Monera) is outdated. Modern classification systems recognize two domains:

* Bacteria: Includes all prokaryotic organisms with cell walls containing peptidoglycan.

* Archaea: Includes prokaryotic organisms with unique biochemistry and often found in extreme environments.

So, while Monera used to be the kingdom for prokaryotes, the current classification places them in separate domains.