"Commonsense Darwinism surveys and responds to recent philosophical discussions of the implications of evolutionary biology. Lemos defends an objectivist account of ethics and criticizes Michael Ruse's nonobjectivist evolutionary ethics, while explaining his own differences with other writers who combine evolution and objective ethics. He expounds and criticizes James Rachels's argument that Darwinism implies vegetarianism, and examines Alvin Plantinga's attempt to show that if evolution is true, we cannot know anything. Lemos looks closely at various views on the issue of whether people are necessarily fundamentally selfish, and also argues that evolution is fully compatible with free will."--BOOK JACKET.