any life form that consists of just a single cell. Most of life is unicellular, with bacteria serving as the majority. The main groups of unicellular life are bacteria, archaea (both prokaryotes), and the eukaryota (eukaryotes). The differences between the prokaryota and eukaryota are significant: eukaryotes possess a nucleus, while prokaryotes lack it, and eukaryotes possess a range of subcellular organs called organelles, while prokaryotes are very minimal. This diagram can also be used to describe a unicelluar organism since it is a prokaryote that is bacteria.
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