1. Inquiry 10/25 + 26 Take out your pink Clocks in Rocks packet Prepare for a warm-up Pick up the papers by the fish tank

2. Warm-Up 10/25 + 26 How old would the bottom row of fossils likely be? How old would the top row of fossils likely be? (Half-life of C-14 is 5730 years) 100% C-14 0% N-14 50% C-14 50% N-14 25% C-14 75% N-14 12.5% C-14 87.5% N-14

3. Goal Updates Find your notecard Put a sticker on it if you are honestly achieving your goal, a half sticker if you are only halfway, or none Write today’s date next to the sticker: 10/25

4. Learning Targets I can radiometric dating to determine the age of fossils I can describe how comparative embryology provides evidence for evolution

5. Solving Radiometric Dating Problems Half-livesTime (years)Mass (g) 0 (today) 1 2 3 4 50% P, 50% D 100% P, 0% D 25% P, 75% D 12.5% P, 87.5% D 6.25% P, 93.75% D

6. You find evidence of bacteria that lived in old lava rocks. You measure the amounts of K-40 (parent) and Ar-40 (daughter) in the rocks. The sample contains 12.5% parent isotopes and 87.5% daughter isotopes. It also contains.5 grams of K-40. The half-life of K-40 is 1.3 billion years. How old are the rocks and bacteria fossils? How much uranium 238 was found in the original specimen, before it died?

7. Solving Radiometric Dating Problems Half-livesTime (years)Mass (g) 0 (today) 03.0 g 1 1.3 by1.5 g 2 2.6 by1.0 g 3 3.9 by.5 g 4 50% P, 50% D 100% P, 0% D 25% P, 75% D 12.5% P, 87.5% D 6.25% P, 93.75% D

8. Your Turn! Complete the front side of the green worksheet

9. Embryology Activity Put the correct embryo in the correct stage for the correct organism. Discuss with your teammates, come up with the solution. Flag me down and I’ll tell you how many you have correct.

10. Embryology Activity On a scale of 1 (very easy) to 10 (very difficult), how tough was it to get all 15 correct answers? Why? Which was the easiest? Which was the toughest? What do the three most similar have in common?

11. Comparative Embryology Embryos of diverse organisms look very similar!

12. Comparative Embryology Shows that same groups of embryonic cells develop in same order and in same patterns to produce organs, etc. Groups of cells produce homologous structures Snapping Turtle Embryo Cat Embryo

13. Homologous Structures

14. Due next time…. Quiz Review and purple review worksheet You will have a quiz next time on everything on the quiz review. We will check answers to the review before the quiz next time.

15. PhET Online Activity Grab your ASSIGNED COMPUTER Find the PhET Simulation on my website. Have fun!