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4chapter17

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Transcript

  • 1. The History of Life Nathaniel Novak Period 4
  • 2. Fossils
    • Fossils show that there was definitely life an earth a long time ago and gives us information on how life has changed.
  • 3. Early Earth
    • Earths early atmosphere was highly toxic. Eventually oxygen levels rose and made life possible for new organisms.
  • 4. Sexual Reproduction
    • Eventually cells began to reproduce sexually which allowed evolution too happen much faster.
  • 5. The Rise of Multicellular Life
    • In the Paleozoic era marine life evolved and during the Devonian period animals first crawl onto land.
  • 6. Mesozoic Era
    • Dinosaurs and flowering plants become abundant.
  • 7. Cenozoic Era
    • This was the age of mammals that could live on land sea or in the air.
  • 8. Significant Extinctions
    • Mass extinctions have wiped out entire species and leave habitats open for new ones. One theory for how dinosaurs became extinct is a huge meteor hitting earth.
  • 9. Evolution
    • Convergent Evolution is when organisms start to look like each other.
    • Coevolution is when two different species evolve because of changes in each other.
  • 10. How Life Has Changed
    • Life has changed very much over time, all the way from very simple, single celled organisms, to extremely complex, multicellular organisms such as Humans.

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