   Godfrey-Smith (2001, page 336) defined explanatory adaptationism in this way: “The apparent design of organisms, and the relations of adaptedness between organisms and their environments, are the big questions, the amazing facts in biology. Explaining these phenomena is the core intellectual mission of evolutionary theory. Natural selection is the key to solving these problems; selection is the big answer. Because it answers the biggest questions, selection has unique explanatory importance among evolutionary factors.”