Fact 1: Mutations are essential for evolution to occur. Fact 2: Evolution can be defined as continual progress. Given the two facts above, what is mutation essential for?

Choose from: (I) rapid expansion. (II) sickness. (III) a continual progress. (IV) resistance. (V) growth. (VI) allow growth. (VII) Plant reproduction. (VIII) chromosomes.
Answer:
(III)