Archaea are a subset of unicellular organisms that have been shown to have a different lineage compared to bacteria.
Archaea and bacteria differ in the composition of their cell walls and the sequence of some of their genes.
Archaea were first discovered in extreme environments of high temperature or high salt, leading to the term "Archaea," meaning ancient.
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Some archaea were found to have proteins closely resembling those found in eukaryotes.
These organisms were discovered in a geological formation where geothermally heated water is released from the Atlantic Ocean floor.
Further related members were found in unusual ecosystems and were collectively named the Asgard, after the home of the Gods in Norse mythology.
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