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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 are the organisms which have one cell  it is also known as a single-celled organism.  example: Amoeba, Bacteria, Euglena, Paramecium,  Cyanobacteria e â¦ tc.    Multicellular organisms are organisms that consist of more  than one cell. example man, bird, panda, parrot etc.