2. Life and Geologic Time Sci 4.1

3. Geologic time scale: history of earth most units based on types of living things

4. Question 1

5. Units: Eon – longest Era Period Epochs – shortest

8. Question 2

9. Organic evolution: time how species change over time

10. Okapi: Relative of the giraffe

11. Question 3

12. Species: Members reproduce with each other to produce viable offspring. viable: can reproduce

14. Question 4

15. Natural Selection Charles Darwin’s idea organisms best suited for their environment are “selected” by nature all others become extinct.

19. Question 5

20. Changes in environment can pressure species to evolve

22. Question 6

23. Artificial selection: people, not nature, doing the selecting domesticated animals, hybrid plants

25. Question 7

26. Trilobites (3 lobes) lived in oceans >200 mil. years, extinct now hard exoskeletons made good fossils changed over time

27. Question 8

28. Could’ve been 1 st creatures to have eyes.

29. Some species lost eyes over time.

30. What’s not needed can be lost over many generations.

31. Pangea (Pangaea) when all continents came together ~200 mya trilobites became extinct

33. Question 9