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Protozoans are also strictly non-multicellular and exist as either solitary cells or cell colonies. Nevertheless, some colonial organisms (e.g., Dictyostelium discoideum, supergroup Amoebozoa) exhibit high levels of cell specialization that border on multicellularity.
Protozoa eat single-celled organisms such as bacteria and other protists; they do so either by engulfing their prey with their bodies or via animal-like mouth structures. The best-known type of protozoan is the amoeba, which eats by engulfing bacteria.Protozoa are capable of causing disease in humans.