The Big Questions series is designed to let renowned experts address the 20 most fundamental and frequently asked questions of a major branch of science or philosophy. Each 3,000-word essay simply and concisely examines a question that has eternally perplexed enquiring minds, and provides answers based on the latest research. This ambitious project is a unique distillation of humanity's best ideas. In Big Questions: Evolution, Francisco Ayala answers the 20 key questions: What is evolution? What is natural selection? Is evolution a random process? What are chromosomes, genes and DNA? What is molecular evolution? What is the tree of life? What does the fossil record tell us? Is intelligence inherited? Can I clone myself? Is language a uniquely human attribute? Was Darwin right? What is 'survival of the fittest'? What is a species? How do genes build bodies? How did life begin? Am I really a monkey? What is the missing link? Will humans continue to evolve? Where does morality come from? Is Creationism true?