The process by which a stem cell becomes specialized into a specific type of cell in a multicellular organism is called cell differentiation, which is present in the first option.
Cell differentiation is the process by which a single stem cell is converted into another cell type by receiving and responding to a specific type of stimulus. The stem cell can be of different types, such as totipotent stem cells or multipotent stem cells, and make different kinds of cells.
Hence, the process by which a stem cell becomes specialized into a specific type of cell in a multicellular organism is called cell differentiation, which is present in the first option.
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