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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.
What is a Coral? What we commonly call corals includes a variety of types of organisms that biologists refer to as coelenterates or cnidarians. One of the main physical characteristics of this group is that they all have a single body cavity and opening, a coelenteron, that doubles both for the ingestion of food and for the release of digested wastes.