Introduction: Sometimes people have trouble believing that complicated structures can be formed by the natural selection of traits that are caused by random mutations. Charles Darwin said that “To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree." What do you think this means?​