the mutation rate the ability of offspring to reproduce the amount of food an organism obtains the ability to withstand environmental extremes
I gave my students this multiple choice question: Which factor most accurately describes the statement "Survival of the fittest" in relation to natural selection?

Only one answer is correct among these 4 choices:
- the mutation rate
- the ability of offspring to reproduce
- the amount of food an organism obtains
- the ability to withstand environmental extremes

Could you tell me which one is correct?

the ability of offspring to reproduce