What is the difference between density dependent limiting factor and density independent limiting factors

Density dependent limiting factors depend on the size or growth of the population and density independent limiting factors limit the size of a population whose effect is not dependent on the number of individuals in the population.

They both have rock surfaces

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.