Answer;
They differentiate
Step-by-step explanation;
-Cells in multicellular organisms differentiate as they continue to divide and increase in size because cells will now perform special functions and have become different to other cells.
-Cellular differentiation is the process by which a less specialized cell becomes a more specialized cell type. Most types of animal cells differentiate at an early stage. They become specialized for a particular function and cannot change into different types of cells. In mature animals, cell division is mainly restricted to replacement and repair.