Large cells have more trouble functioning than small cells because the interior of a cell grows at a faster rate than the exterior. This poses problems for large cells because the outside of the cell cannot transport nutrients and water as efficiently to the inside of the cell.
Single cells undergo a process called mitosis to prevent them from becoming too large to survive. Mitosis involves the splitting of a single cell into two daughter cells with the same exact DNA.
Cells use contact inhibition to eventually stop the process of mitosis . For example, cells placed in a dish will undergo mitosis until the entire dish is full of new cells. Once the dish is full and all of the cells come into contact, the mitosis process stops.