Unicellular organism
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Definition
A unicellular organism or single-celled organism (or single-cell organism) is an organism that comprises only one cell.
They are contrasted with multicellular organisms.
Interaction with existing classifications
- All prokaryotes are unicellular organisms. Prokaryotes include all organisms in the domains archaea and bacteria.
- Among eukaryotes (i.e., the eukarya domain), there are some unicellular organisms and some multicellular organisms. Specifically, the protists and unicellular, whereas plants, animals, and fungi are multicellular.
