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Chapter 14

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  1. Chapter 14 History of Life Pg. 278

  2. Biogenesis- states that all living things come from other living things • Spontaneous generation- living things come from nonliving things

  3. The 17th century • Believed that living things could come from non-living things

  4. Francisco Rediinvestigated the commonly held belief that flies spontaneously generated from meat. He discovered that maggots developed where flies previously had landed.

  5. Francesco Redi Control group Experimentalgroups

  6. The invention of the microscope enabled scientists to study microorganisms in the seventeenth century

  7. Thevitalforce • Vital Force, the force - the energy of life, that makes the difference between a dead and a living body • Vital force definition, the force that animates and perpetuates living beings and organisms

  8. LazzaroSpallanzani

  9. His results were not accepted because it was claimed that he had destroyed the “vital force” which must be present in order for life to come about.

  10. Louis Pasteur • Incorporated a curved neck in his flasks that allowed the “vital force” to be present

  11. Biogenesis it is… • Pasteur’s work earned him the prize for confirming biogenesis

  12. Pasteurization- the process of heating food to kill microorganisms

  13. How did first life forms come about?

  14. History of Life timeline 12:01 Earth’s Crust Forms 12:04 Inferred origin of life 12:10 Oldest rocks preserved on the Earth’s surface 12:13 1st fossil evidence of life, algae cells 12:17 First bacteria 12:40 First cells with a nucleus 12:41 First multi-celled organisms, seaweed and algae 12:52 First diverse sea life 12:53:25 First fish 12:53:34 First land plants 12:54 First insects 12:55 First amphibians and reptiles 12:57 First dinosaurs 12:57 1st mammals 12:58 1st birds 12:59: 58 1st Human Ancestor 12:59:59.2 Ice Age 12:59:59.9 1st modern human