“For Darwin, natural selection is a drawn-out, complex process involving multiple interconnected causes. Natural selection requires variation in a population of organisms. For the process to work, at least some of that variation must be heritable and passed on to organisms’ descendants in some way. That variation is acted upon by the struggle for existence, a process that in effect ‘selects’ variations conducive to the survival and reproduction of their bearers.”—Peter Gildenhuys,
“Natural Selection.” Stanford Encyclopedia of Philosophy. September 25, 2019.