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Life and Geologic Time

Life and Geologic Time. Sci 4.1. Geologic time scale:. history of earth most units based on types of living things. Question 1. Units:. Eon – longest Era Period Epochs – shortest. Question 2. Organic evolution:. time. how species change over time. Okapi: Relative of the giraffe.

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Life and Geologic Time

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  1. Life and Geologic Time Sci 4.1

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

  3. Question 1

  4. Units: • Eon – longest • Era • Period • Epochs – shortest

  5. Question 2

  6. Organic evolution: time • how species change over time

  7. Okapi: Relative of the giraffe

  8. Question 3

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

  10. Question 4

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

  12. Question 5

  13. Changes in environment • can pressure species to evolve

  14. Question 6

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

  16. Question 7

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

  18. Question 8

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

  20. Some species lost eyes over time.

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

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

  23. Question 9

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