Here's a breakdown:

* Growth: New cells are essential for an organism to increase in size. From a single fertilized egg, cell division creates all the cells needed to form a complex body.

* Development: Cell division allows for the specialization of cells, forming different tissues and organs with specific functions. This process is crucial for creating the complex structures of a living organism.

* Repair: When tissues are damaged, cell division replaces lost or injured cells, allowing the body to heal.

* Reproduction: In many organisms, cell division is the basis of reproduction. For example, the formation of gametes (sperm and egg) relies on cell division.

In short, cell division is the fundamental process that allows for life to exist, grow, and continue.