Creationists criticize the idea of natural selection as a circular argument, or tautology, claiming "the fittest are those that survive, and survival is how fitness is defined." why is our definition of natural selection not tautological? a. fitness also includes a reproduction component. b. natural selection is measured by contribution to the next generation, not simply survival of an individual organism. c. creationists use religious definitions of these terms, not scientific ones. d. creationists do not realize that evolutionary biologists recognize other mechanisms of evolution, including genetic drift. e. this is a legitimate criticism of natural selection and even darwin acknowledges it in on the origin of species.