Question

what is one main reason mitosis happens in multi - celled organisms? to reduce the number of chromosomes in cells. to allow them to grow and replace damaged or dead cells. to produce gametes for sexual reproduction. to increase genetic diversity in the population.

Explanation:

Mitosis is a process of cell - division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus. In multi - celled organisms, it is crucial for growth and repair, replacing damaged or dead cells. Meiosis reduces the number of chromosomes and produces gametes for sexual reproduction, and genetic recombination during meiosis increases genetic diversity.

Answer:

To allow them to grow and replace damaged or dead cells.