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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).
Types of multicellular organism. 1) Mutlicellular prokaryote: Most bacteria are unicellular, but some bacterial species are multicellular like Myxobacteria. Some species of cyanobacteria are also multicellular like Chara, Spirogyra etc. Magnetotactic bacteria are also multicellular.