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Life on earth is characterized by three striking phenomena that demand explanation: adaptation-the marvelous fit between organism and environment; diversity-the great variety of organisms; and complexity-the enormous intricacy of their internal structure. Natural selection explains adaptation. But what explains diversity and complexity? Daniel W. McShea and Robert N. Brandon argue that there exists in evolution a spontaneous tendency toward increased diversity and complexity, one that acts whether natural selection is present or not. They call this tendency a biological law-the Zero-Force...

Life on earth is characterized by three striking phenomena that demand explanation: adaptation the marvelous fit between organism and environment; diversity the great variety of organisms; and complexity the enormous intricacy of their internal structure. Natural selection explains adaptation. But what explains diversity and complexity? Daniel W. McShea and Robert N. Brandon argue that there exists in evolution a spontaneous tendency toward increased diversity and complexity, one that acts whether natural selection is present or not. They call this tendency a biological law the Zero-Force...