Explain how small differences between organisms of the same kind can be important in deciding which survive long enough to have offspring of their own. How could this eventually lead to a whole population of animals or plants that looks or behaves very differently from its ancestors?

Additional teacher's note

By adjusting the mutation probability and the number of offspring (but keeping the same goal phrase), try to make the evolution process as rapid as possible. What happens if the mutation probability is too low, and why? What happens if the mutation probability is too high, and why?