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That’s all organisms have multiple cells

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Answered by GPT-5 mini AI
Not necessarily — many organisms are single-celled (unicellular), not multicellular. Examples:
- Bacteria and Archaea (e.g., E. coli) — always single cells.
- Many protists (Amoeba, Paramecium) and some algae.
- Some fungi are unicellular (yeasts).

Multicellular organisms include most animals, plants, and many fungi. There are also intermediate cases (colonial organisms like Volvox) and multicellularity evolved independently several times. Viruses are acellular and usually not considered true cells or, by some definitions, living organisms.

Do you mean to ask whether all organisms are multicellular, or something else?