Amutation that will be passed from parent to offspring is a mutation that occurred during meiosis or mitosis?

I think  the answer you are looking for is mitosis I feel about 98% confident , best wishes and good luck :)

The answer is Meiosis because Mitosis is when the daughter cell is exactly the same as the parent and Meiosis creates 2 cells the same and are divided in half to create 4 different cells with half the number of chromosomes

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.