However, it's important to note that the classification of living things is constantly evolving. The traditional five-kingdom system (Animalia, Plantae, Fungi, Protista, and Monera) is no longer widely accepted.

Modern classification systems often use a three-domain system:

* Bacteria: Includes all bacteria.

* Archaea: Includes single-celled organisms similar to bacteria but with distinct biochemical and genetic characteristics.

* Eukarya: Includes all organisms with eukaryotic cells (plants, animals, fungi, protists).

So, while bacteria were previously classified under the kingdom Monera, the term "Monera" is less common today.