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Archaea is one of the three domains of life (the other two being bacteria and eukarya). Together with bacteria, it is one of the two prokaryotic domains of life; meaning that they lack discrete membrane-bound organelles. It was established as a separate domain from bacteria after biochemical and genetic studies revealed that archaeans formed a genetically distinct group with distinctive biochemistry (notably in the lipid composition of their cell membranes) and metabolic pathways.[1]