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Unicellular organisms are composed of a single cell. Multicellular organisms are composed of many specialized cells. Specialized cells differ in structure (size, shape...) and function (the role they perform in the organism).
Unicellular organisms only have one cell, multicellular organisms have more than one cell Well, unicellular organisms have one cell, and multicellular organisms have man â¦ y. Uni means one, multi means many