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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).
By contrast, a multicellular organism is made up of many cells that are dependent on each other to perform these essential functions as a group. The cells have divided up the labor and each cell has become specialized to perform a specific task.This specialization is a key characteristic of multicellular organisms.y contrast, a multicellular organism is made up of many cells that are dependent on each other to perform these essential functions as a group. The cells have divided up the labor and each cell has become specialized to perform a specific task.