MOST MULTICELLULAR CREATURES are eukaryotes (83% of all species, with nucleated cells with other organelles enclosed within membranes), but not all eukaryotes are multicellular (many are unicellular — amoeba, paramecium, yeast, etc). Most prokaryotes (without membrane-bound nucleus or organelles) are not generally considered multicellular although bacteria can form operational colonies (i.e.: cyanobacteria, etc) and biofilms (i.e.: many bacteria) with quorum sensing communication. But the colonies lack organs. Also some prokaryotes may have multicellular stages in their life cycle (i.e.: myxobacteria). But overall, 99% of prokaryotes are unicellular.
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