Origin of the species - Due to genetic mutations, organisms acquire new traits. If these traits are suited to their environment, they provide the organism with a survival advantage, reducing its competition with other organisms, allowing the organism to breed more and allowing the trait to be inherited by offspring. Based on observation of Galapagos Islands, where he saw finches with differently shaped beaks depending on their food source (soft berries on the ground, hard fruits etc). Allows for the appearance of design in the universe via an inevitable, mindless process