Darwin’s discussion of the imperfections of natural selection provides insight into the relationship between natural selection and progress. Although natural selection does not automatically create perfectly adapted species, it never chooses characteristics that injure the species and leave it with less of a chance for survival. Therefore, natural selection ensures that each species improves, rather than worsens, in comparison to its ancestors. Progress always creates a better natural society for all species, even though they develop individually. Social theorists later utilized Darwin’s theory of natural selection to account for social progress. They asked whether society always progresses in an upward trend, getting better and more advanced, or if it was it possible for society to degenerate. Although Darwin argues that progress is always positive as a result of natural selection, some social theorists argued that society could degenerate with the rise of poverty and crime.