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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).
A multicellular organism is an organism with more than one cell, unlike an unicellular organism, that has only one cell. Multicellular organisms include plants, animals and hâ¦uman beings. Unicellular organisms include protozoans and specific algae like brown algae.