1. Aim: How did Earth evolve to support life? How did life evolve?
Do Now: Answer the two questions below.
- 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)
How do you think scientists know about the gasses in our early atmosphere. Where can it be trapped?
- Oxygen we breathe was produced by plants during Photosynthesis.

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 (mutations).
more favorable mutations are kept through breeding, and less favorable traits are lost (does not breed). Darwin’s Theory of Natural Selection
Charles Darwin

5. Natural Selection Examples:
What is the hummingbird doing?
What does the hummingbirds choice do to the flower?
What does that mean for the flower?
Which giraffe is better adapted to it’s environment?
Why?
What does that mean for the giraffe?

6. IV. Evolution and Fossils
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.

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

8. Closure 1: 1 4 1 2 2 x 2 2 1 2 4 1 1 2 Review Book p.273-276 # 1-15
**SKIP # 7
Answers:
x 2 2