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 cell division process that produces two identical daughter cells. Its key role in growth, repair, and replacement: damaged/old cells are replaced by new cells formed via mitosis. Option 1: "new cells to replace old damaged cells" matches this. Option 2: Cells don't "repair" old cells via mitosis (mitosis makes new cells, not repair old ones). Option 3: Old cells don't self - repair via mitosis (mitosis is about cell division, not cell self - repair). Option 4: Existing cells don't take over functions via mitosis (mitosis is for producing new cells, not reassigning functions of existing cells).

Answer:

A. new cells to replace old damaged cells (assuming the first option is labeled A, if not, the option text "new cells to replace old damaged cells")