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  1. 1. Ch.17 Survey - The history of life <ul><li>Fossil Record </li></ul><ul><li>Earth’s Early History </li></ul><ul><li>Evolution of Multicellular Life </li></ul><ul><li>Patterns of Evolution </li></ul>Kevin
  2. 2. Fossil Record <ul><li>Fossil record can be used as evidence of Earth’s long history and the change of organisms as time passes. </li></ul><ul><li>Mostly found in sedimentary rock . </li></ul><ul><li>Shows that certain species have become extinct . </li></ul><ul><li>Relative dating compares its placement with those of others in other layers of rock. </li></ul><ul><li>Radioactive dating works by paleontologists’ measuring the amounts of certain isotopes that fossil contains. </li></ul><ul><li>Both technique above help to determine the age of fossils. </li></ul>Hyoung Min
  3. 3. Earth’s Early History <ul><li>Six components of Earth’s early atmosphere: hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water. </li></ul><ul><li>Contain little or no oxygen. </li></ul><ul><li>Rising Oxygen drove some lives to extinction while new organisms generated by it. </li></ul><ul><li>Ocean didn’t exist. </li></ul>Kevin
  4. 4. <Formation of the Earth> Organic molecules Photosynthetic oxygen Water Atmospheric oxygen Eukaryotes Sexual reproduction Multicellular organisms Kevin
  5. 5. Evolution of Multicellular life <ul><li>Precambrian Time : Unicellular life started to change. </li></ul><ul><li>Paleozoic Era : Many types of marine life were altered into new forms of life. </li></ul><ul><li>Cambrian Period : Evolvement of animals with hard outer bone occurred. </li></ul><ul><li>Ordovician and Silurian Periods : Fishes having no jaw and land plants appeared as the first time. </li></ul>Hyoung Min
  6. 6. Precambrian Time -Unicellular life evolves. Hyoung Min & Kevin
  7. 7. Evolution of Multicellular life <ul><li>Devonian Period : Animals began to move to the land. </li></ul><ul><li>Carboniferous and Permian Periods : Forests and winged insects evolved. </li></ul><ul><li>Mesozoic Era : Flower appeared. </li></ul><ul><li>Cenzoic Era : Mammals flourished everywhere. </li></ul>Kevin
  8. 8. Patterns of Evolution <ul><li>Examples of patterns of Macroevolution : Mass extinction, Adaptive radiation, Coevolution, Punctuated equilibrium, and changes in developmental genes. </li></ul><ul><li>Through Mass extinction , a lot of species disappear very quickly. </li></ul><ul><li>By adaptive radiation , some species evolve into different forms. </li></ul><ul><li>During coevolution , the pattern of macroevolution reacts to the changes in each other overtime. </li></ul>Hyoung Min
  9. 9. Hox genes are the basis for major evolutionary changes. Hyoung Min