Examining the origins debate, part 5
This is part 5 in a series exploring Gerald Rau's book Mapping the Origins Debate . For other posts in the series, click a number: 1 , 2 , 3 , 4 , 6 , 7 , 8 . The origin of species Charles Darwin (Wikimedia Commons) To be taken seriously, any model of origins must credibly answer the question, How did the various species of life arise? Different models, of course, answer differently. There even are differences among the evolutionary models. For example, Charles Darwin in On the Origin of Species, posited the idea of the gradual development of species ( gradualism )--an idea now discounted by most evolutionary scientists as a primary or single explanation. Evidence against gradualism In positing gradualism, Darwin drew on Charles Lyell's idea of uniformitarianism, relying on evidence from body structure (morphology) and theorizing that the primary mechanisms for gradual development of species were natural selection (survival of the fittest) and mutat