The division of labor within a multicellular organism is called cell specialization or differentiation. This process results in the formation of various cell types, each with specific functions that contribute to the overall operation of the organism. For instance, in animals, specialized cells include neurons (for signaling), muscle cells (for movement), and epithelial cells (for protection). Such specialization enhances efficiency and functionality, allowing complex organisms to perform essential tasks and respond to environmental changes. Cell specialization is fundamental for maintaining homeostasis and promoting survival.