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Ch. 17 Noteguide – The History of Life

Ch. 17 Noteguide – The History of Life. 17.1 The Fossil Record. Are scientists who study fossils Life on Earth. It also shows how different groups of organisms have changed over time. Incomplete, because it takes precise combinations of conditions Extinct Precise combinations of conditions.

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Ch. 17 Noteguide – The History of Life

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  1. Ch. 17 Noteguide – The History of Life

  2. 17.1 The Fossil Record • Are scientists who study fossils • Life on Earth. It also shows how different groups of organisms have changed over time. • Incomplete, because it takes precise combinations of conditions • Extinct • Precise combinations of conditions

  3. How fossils form: • Exposure to rain, heat, wind and cold breaks down existing rocks. • Minerals replace all or part of the organisms body.

  4. How scientists determine the age of a fossil: • Relative dating • Rock layers • Index fossils • Relative dating

  5. 2. How Scientists determine the age of a fossil • Radioactive dating • Half-life • Carbob-14 is taken in by living things and released slowly when they die. • To determine when the organism lived. • Carbon-14 • Carbon-12

  6. Geologic Time Scale • Represent evolutionary time. Places Earth rock in order by relative age. • Precambrian • Time between Precambrian + 3 eras • Paleozoic • Mesozoic • Cenozoic • Eras that are subdivided

  7. 17.2 Earth’s Early HistoryHow did life on Earth Initially begin? • Heat to melt the entire globe • The most dense elements form the Earth’s core. • The early Earth was much hotter with little oxygen.

  8. How did life on Earth Initially begin • 27. lots of dissolved iron • 28. proteinoid microspheres • 29.RNA • 30. nucleotides • 31. a series of experiments (miller and Urey) • 32.microscopic fossils • 33.oxygen gas • 34. oxygen for respiration

  9. 35. proposes that eukaryotic cells arose from living communities formed by prokaryotic organisms

  10. 36. refers to the large scale evolutionary changes that take place over long periods of time. • 37. slow and steady • 38. horseshoe crab • 39. rapid evolution • 40. hox genes

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