Members of the Archaea have been observed most commonly in very extreme (with respect to temperature, salinity, pressure, etc.) environments.
Archaea is a single-celled organism domain. These microorganisms are prokaryotes because they lack cell nuclei. Archaea were originally classified as bacteria and given the name archaebacteria, but this term has since become obsolete.
Halophiles (microorganisms that can live in extremely salty environments), methanogens (microorganisms that produce methane), and thermophiles are all examples of archaebacteria (microorganisms that can thrive extremely hot environments).
Archaea also have enormous economic potential, which has yet to be fully realized in the production of thermostable polymerases. They decompose organic matter to produce methane, which is then used for cooking and lighting.
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