How are "by means of natural selection" and "survival of the fittest" not just based on chance?

If lightning strikes a rain forest and kills a lot of animals, survival would be based on luck. If a shark swims into a school of fish, it might be the lucky fish that survive.

1 Answer
Feb 2, 2016

Natural selection is not random. It's the natural process that lead the "best" individuals to survive and reproduces.


In nature, among species, there is variation. This variation might lead to individuals more likely to survive and/or to reproduce. those can be called " the fittest".

If natural selection was purely random and based on chance, it would mean that a bad hunter wouldn't have wors chance of surviving or that more attractive reproducers wouldn't have better chance of reproduction.