1. BES 10/10 and 10/11
Please take out your lab book and purple inventory sheet
Get ready to hear your new seat!

2. 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

3. 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

4. Major Events on Earth
Get two whiteboards, post-its, and a dry-erase marker (per table)
Write each event below on a post-it.
Place the post-its 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

5. 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).

6. 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

7. 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

8. Some Cambrian Animals