1. Biology w/Earth Systems Oct 12 & 13
Get out your journal and a pencil.
Turn in your test corrections.
Get out your Sea Floor Spreading CER—hold on to it.

2. Warm Up for Oct. 12 & 13
What is your best estimate for when the following events happened on Earth? Estimate how many years ago (thousands, millions, billions?)
Formation of Earth
Existence of Dinosaurs
First Plants
Existence of Humans

3. Sea Floor Spreading CER
Switch papers with the person across from you.
In yellow highlighter, highlight any evidence that is specifically cited from the article.
In green highlighter, highlight any evidence that is specifically cited from the diagram.
In pink highlighter, highlight what you think is their reasoning that ties the evidence to the claim.

4. Unit Two: Evolution You will learn:
How evolution happens (natural, artificial, and sexual selection)
Evidence for evolution (fossil record, homologous structures, embryology)
Relative and Radiometric Dating
How physical properties of Earth change
Earth’s formation and early history

5. Learning Targets! I can make a model of the evolutionary timeline
I can describe physical changes that have occurred on Earth and evidence for those changes

6. Major Events on Earth Place these events in order
With your elbow partner:
Get two white boards and place them side by side.
Place the cards in order.
Under each event, write the date you think it occurred (between 15 bya and today)
First simple cells
Universe formed
First oxygen First plants
First complex cells First animals
Earth formed
First oceans
Dinosaur extinction

7. Cosmos Video Guide Wrap-Up
Big Idea:
Earth’s physical characteristics are constantly changing. Give 3 examples of this idea from the video, including how we know (the evidence).

8. Back to your timeline… How close were you? Universe formed- 15 bya
Earth formed- 4.6 bya
First oceans- 3.8 bya
First simple cells- 3.6 bya
First oxygen- 2.2 bya
First complex cells- 1.7 bya
First animals- 700 mya
CAMBRIAN EXPLOSION!- 545 mya
First plants- 470 mya
PERMIAN EXTINCTION!- 250 mya
Dinosaur extinction- 65 mya
First humans- 200,000 years ago

9. The Cambrian Explosion
545 mya, the fossil record shows an explosion of life!
High oxygen and no predators = evolution and survival of bizarre sea creatures

10. Some Cambrian Animals