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12 The History of Life

12 The History of Life

12 The History of

CHAPTER12The Historyof LifeKEY CONCEPTS12.1 The Fossil RecordFossils are a record of life that existed in the past.12.2 The Geologic Time ScaleThe geologic time scale divides Earth’s history based onmajor past events.12.3 Origin of LifeThe origin of life on Earth remains a puzzle.12.4 Early Single-Celled OrganismsSingle-celled organisms existed 3.8 billion years ago.12.5 Radiation of Multicellular LifeMulticellular life evolved in distinct phases.12.6 Primate EvolutionHumans appeared late in Earth’s history.BIOLOGYCLASSZONE.COMBIOLOGYView animated chapterconcepts.• Endosymbiosis• Comparing Hominoid Skulls• Geologic Time ScaleKeep current with biology news.• Featured stories• News feeds• PollsRESOURCE CENTERGet more information on• Earth’s Ancient Past• Geologic Dating Methods• History of Life358 Unit 4: EvolutionTHUMBNAIL 06.28.05

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