Answer:
The correct answer is differentiation.
Explanation:
Differentiation refers to the processes by which different cell types arise from stem cells and become completely different from each other. Differentiation process completed by the gene expression.
The maturation of a cell or cell becomes specialized for the specific function by this process of differentiation. For the example meristems rise different types of cells on the basis of different functions.
Thus, the correct answer is differentiation.