Which of the following is not needed in a population in order for natural selection to act? a) genetic variation b) a strong body c) overproduction d) a struggle for existence

The correct answer is C. Overproduction. Genetic variation can lead to natural selection because those with a certain gene might be more suited for that specific environment than others. Strong bodies are never bad for natural selection, but a will to survive and exist is also a strong factor and can separate those who will survive and those who won't. Overproduction does not affect natural selection.