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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).
Levels 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. 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.