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| Early Attempts to Understand the Origin of Life Current Thinking About the Origin of Life Extraterrestrial Origin for Life on Earth Earth Origin for Life on Earth Meeting Metabolic Needs— Heterotrophs or Autotrophs The Heterotroph Hypothesis The Autotroph Hypothesis Reproduction and the Origin of Genetic Material Major Events in the Early Evolution of Living Things The Development of an Oxidizing Atmosphere The Establishment of Three Major Domains of Life From Prokaryotic to Eukaryotic Cells The Role of Natural Selection in Evolution A Closer Look: The Voyage of HMS Beagle 1831–1836 What Influences Natural Selection? Genetic Diversity Resulting from Mutation Genetic Diversity Resulting from Sexual Reproduction Acquired Characteristics Do Not Influence Natural Selection Processes That Drive Natural Selection Differential Survival Differential Reproductive Rates Differential Mate Selection The Hardy-Weinberg Concept A Closer Look: The Development of New Viral Diseases A Closer Look: Human-Designed Organisms Accumulating Evidence of Evolution Species: A Working Definition A Closer Look: Is the Red Wolf a Species? How New Species Originate The History of the Development of Evolutionary Thought The Tentative Nature of the Evolutionary History of Organisms |