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Bryce Roberts Period 5 (This is an example of Archaea that live in the human body) =Archaea= The Archaea are a group of unicellular microorganism. A single individual or species from this domain is called an // archaeon //. They have no cell nucleus or any other membrane-bound organelles within their cells. In the past they had been classed with bacteria as prokaryotes and named archaebacteria, but this classification is regarded has been ruled outdated. They now show enough differences to be one out of three domains of the three domain system.

Archaea are divided into four recognized phylum, but many more phyla may exist. Of these groups, the Crenarchaeota and the Eukarchaeota are the most intensively studied. Classification is still difficult, because the vast majority have never been studied in the laboratory and have only been detected by analysis of their nucleic acids in samples from the environment. Initially Archaea were thought to only be found in Salt lakes or hot springs, and the human colon. Archaea are numerous in the oceans. The Archaea in plankton, may be the most abundant group of organisms on the planet.

Archaea were first classified as a separate group of prokaryotes in 1977 by Carl Woese and George E. Fox. It was originally named Archaebacteria and treated as a kingdom. Woese how ever argued that these prokaryotes are different sort of life. After countess argueing on whether Archaea should be classified as Archaebacteria or bacteria, the two domains were later named Archaea and Bacteria. The word //"Archaea"// means ancient in Greek. The classification of archaea, and of prokaryotes in general, is a rapidly moving and contentious field. Current classification systems aim to organize archaea into groups of organisms that share structural features and common ancestors.

// [|Watch Some Archaea In Action!] //
(This Archaea is found in animals) 1) [] 2) [] 3) [] Thanks to "jasonroberts8291" for the video.
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