Question

mitosis is important because it allows
new cells to replace old damaged cells.
new cells to repair old damaged cells.
old cells to self - repair when they become damaged.
existing cells to take over the function of damaged cells.

Explanation:

Mitosis is a process of cell division. During mitosis, one cell divides into two identical daughter cells. When cells are damaged, mitosis occurs to produce new cells. These new cells replace the old damaged cells. Cells do not repair old damaged cells through mitosis (it's about replacement, not repair of the same old cell). Old cells do not self - repair via mitosis (mitosis is about new cell production). Existing cells do not take over the function of damaged cells through mitosis; instead, new cells are formed to replace them.

Answer:

new cells to replace old damaged cells.