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Designed for courses in Introductory Psychology, this fifth edition reflects a careful revision that treats the discipline as an experimental and natural science. One of the book's major themes is that behavior can best be understood in the context of its adaptive significance. Features include "Evaluating Scientific Issues" and "Biology and Culture" essays. New Chapter 3: "Evolution, Heredity and Behavior." It combines a scholarly survey of research with applications of research results to problems that confront us today.