Which of the points of natural selection is also referred to as "survival of the fittest"? More offspring are born than can be supported by the environment. If too many offspring are born, they will be forced to compete for resources. Genetic variation leaves some offspring better adapted to their environment than others.
The third one is the answer.
The first one is overproduction.
The second one is competition.
The third one is survival of the fittest, because if there are six grey mice and two brown mice in a brown field, which is more likely to be eaten by a predator? The grey mice are. Their genetic material helps them to survive and therefore be fit to their environment.
