1 / 17

Summary of Major Events in the Evolution of Life

Summary of Major Events in the Evolution of Life. 18 Billion Years Ago. BIG BANG The universe began with the so called Big Bang, an event about 13 - 18 billion years ago, during which all the matter in the universe was scattered in enormous explosion. 4.6 Billion Years Ago.

claude
Download Presentation

Summary of Major Events in the Evolution of Life

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Summary of Major Events in the Evolution of Life

  2. 18 Billion Years Ago • BIG BANG • The universe began with the so called Big Bang, an event about13 - 18 billionyears ago, during which all the matter in the universe was scattered in enormous explosion.

  3. 4.6 Billion Years Ago • Big Rock: Earth Forms • The first atmosphere began to form from: CO2, CO, water vapor, N2, H2S, and small traces of CH4, and NH3. • Lack of Oxygen.

  4. 3.8 Billion Years Ago • THE ORIGIN OF LIFE. • First Prokaryotic Cells Appear.

  5. 3.2 Billion Years Ago • Autotrophs. • Little change in atmosphere.

  6. 2.8 Billion Years Ago • Strong evidence of photosynthetic organisms. • Oxygen is given off into atmosphere, but still is less than 1%.

  7. 2.0 Billion Years Ago • Blue-Green Algae. • Ozone screen begins to form.

  8. 1.5 Billion Years Ago • First eukaryotic cells appear. • 2% oxygen in atmosphere.

  9. 670 Million Years Ago • Multicellular organisms. • 7% oxygen in atmosphere.

  10. 550 Million Years Ago • Shelled Animals. • Early Land Plants. • 10 % Oxygen in Atmosphere.

  11. 500 Million Years ago • Fishes. • Land plants. • Atmosphere same as today, 20% oxygen. • Complete ozone screen.

  12. 395 Million Years Ago • First amphibians.

  13. 321 Million Years Ago • First reptiles.

  14. 225 million years Ago • First flowering plants. • First birds and mammals.

  15. Mammals

  16. 1 - 2 Million Years Ago • Human Kind - Homo sapiens.

More Related