Unicellular organism

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When people talk about unicellular organisms, they mean organisms that only have one cell. Unicellular organisms are normally from two classification kingdoms; Eubacteria and archaebacteria. Unicellular is normally either a eukaryote (a cell with a nucleus) or a prokaryote (a cell without one). They reproduce asexually and do not have specialized functions.

See also: Multicellular organism

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