1. Aim: How did Earth evolve to support life? How did life evolve? Do Now: Do you think that organisms are more complex now, or were more complex in the past? - What has happened to most organisms on our planet?

2. I. Evolving Atmosphere - Earliest gasses came from the outgassing of volcanoes. - Consist of water vapor (H2O), carbon dioxide (CO2) and nitrogen (N) - Oxygen we breathe was produced by plants during Photosynthesis. How do you think scientists know about the gasses in our early atmosphere. Where can it be trapped?

3. II. Evolving Lithosphere - Rocks are the oldest things that are on our planet. (The oldest rocks are found in Canada date to 4.28 Billion years old ( Faux-Amphibolites )) Why are there not more of these rocks found around the planet? What happens to most rock?

4. III. Evolving Biosphere - Evolution is the gradual change seen in organisms over time - these changes are called variations. - more favorable variations are kept through breeding, and less favorable traits are lost. Darwin’s Theory of Natural Selection

5. -The fossils record shows us that many of the organisms that lived on Earth are now extinct. - Fossils help show how organisms have changed over time. IV. Evolution and Fossils

6. “Lucy” Walking completely upright “handy-man” Closest extinct human relative (Neanderthals). We have DNA from this ancestor You and Me