The answers that apply are;
- reproduction of the organism
- growth of the organism
- repair of damaged or dead cells
- reproduction of new cells
In the reproduction of the organism, mitosis is required in the generation of daughter cells in sexual reproduction.
In the growth of an organism, mitosis is key in the process of a cell replicating its genetic material and itself.
When a cell has been damaged, it is eliminated through apoptosis and digestion after which new cells divide by mitosis to replace the damaged cell.
Mitosis is also required in the reproduction of new cells from existing ones.
