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bacteria that biologists often study. In fact, the differences between regular bacteria and archaebacteria are so great that they are clas*ified apart from other forms of life and have challenged the way scientists clas*ify life into different kingdoms. Though archaebacteria and a regular bacteria were once considered part of the same kingdom, molecular biology and genetics have shown that these prokaryotic organisms have many unique features that merit their own branch on the phylogenetic tree of life. make the distinction between them and bacteria more clear, and there is some disagreement about the exact terms used to clas*ify archaea – whether or not they should be called archaea or archaebacteria. This article will use the terms interchangeably. Photo: Sting via Wikimedia Commons, Public DomainOne of the ways that scientists categorize life forms is by dividing them into different kingdoms, which are based on the cell structure of the organism. The different kingdoms include Fungi, Planitia, An*malia and Monera. The kingdom Protista contained single-celled eukaryotic organisms while the kingdom Monera was believed to encompas* all However, biochemical and genetic studies of bacteria have shown that certain types of prokaryotes places them on their own section of the tree of life. The name of archaebacteria comes from the root “archaea”: meaning “ancient”, which reflects the hypothesis that modern archaebacteria have descended from ancient populations of bacteria Due to advances in biochemistry and genetics, the phylogenetic tree of life contains a new order of clas*ification, the concept of domains system of domains, all eukaryotic organisms including protists, fungi, plants, and an*mals are considered part of the Eukaryota domain. The study of the unique biochemistry possessed by archaebacteria could give researchers more insight into how life worked during ancient, primordial times. Some scientists hypothesize that archaebacteria such as the bacteria Thermoplasma could be the