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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 a community of cells. Cells in a multicellular organism are specialized. The ways in which the cells work together and interact depend on the organism. You can think of the cells of an organism as members of a community.evels of organization in multicellular organisms include cells, tissues, organs, organ systems, and the organism itself. Different tissues working together to perform a particular function represent another level of organization, the organ. The eye is an organ that functions with the tarsier's brain to allow sight.