the answer is Mitosis is the process by which cells divide. Without it, you could make no new cells. The cells in most of your body would wear out very quickly, greatly shortening your life.
Let's say you enjoy swimming. One day you decide to swim alone. But it's a risky idea because you could drown and no one would be there to help you in time. So it's best to have others around incase you have an accident or need help.
