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.
I believe the answer is d
The answer to your question will be A).
Answer:
A. cancer cells aren't outside cells. they are our own cells that have been damamged over time and mutate to become cancerous
