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The History of Life Nathaniel Novak Period 4
Fossils <ul><li>Fossils show that there was definitely life an earth a long time ago and gives us information on how life ...
Early Earth <ul><li>Earths early atmosphere was highly toxic. Eventually oxygen levels rose and made life possible for new...
Sexual Reproduction <ul><li>Eventually cells began to reproduce sexually which allowed evolution too happen much faster. <...
The Rise of Multicellular Life <ul><li>In the Paleozoic era marine life evolved and during the Devonian period animals fir...
Mesozoic Era <ul><li>Dinosaurs and flowering plants become abundant. </li></ul>
Cenozoic Era <ul><li>This was the age of mammals that could live on land sea or in the air. </li></ul>
Significant Extinctions <ul><li>Mass extinctions have wiped out entire species and leave habitats open for new ones. One t...
Evolution <ul><li>Convergent Evolution is when organisms start to look like each other. </li></ul><ul><li>Coevolution is w...
How Life Has Changed <ul><li>Life has changed very much over time, all the way from very simple, single celled organisms, ...
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4chapter17

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4chapter17

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

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