1. Life & Evolution Claire Morgan Knowledge Exchange 09-10-2011

3. Earths History

4. Paleozoic Era: Cambrian

5. Paleozoic Era: Ordovican Brachiopods Mollusks MASS EXTINCTION ~75% of species extinct Sea levels droped ~50 meters Ocean temperatures dropped Glaciers formed over Godwana

6. Paleozoic Era: Silurian Cooksonia MillipedesScorpion Ray-finned fish

7. Paleozoic Era: Devonian MASS EXTINCTION ~75% of species extinct Jawed Fish replaced Jawless Fish Mosses + Ferns evolved on land First Centipedes, Spiders, Mites and Insects Fish like amphibians start to occupy the land Two Meteorites collided with out planet (1)Current day Nevada (2)Current day western Australia

8. Paleozoic Era: Carboniferous Giant tree ferns dominated land Insects evolved wings Amphibians became larger First reptiles evolved Crinoids (sea lillies and stars) Meadows on sea floor

9. Paleozoic Era: Permian Theraspid MASS EXTINCTION ~96% of species extinct Large meteorite crashed into Northwestern Australia Lava poured into oceans reducing O 2 content. Toxic concentrations of CO 2 and H 2 S

10. Mesozoic Era: Triassic MASS EXTINCTION ~65% of species extinct Reptiles Dominated the Mesozoic Era Rise of Crocodilians, Dinosaurs and Birds First frogs and turtles appeared Conifers and seed ferns were dominant trees Meteor crashed into modern day Quebec

11. Mesozoic Era: Jurassic Salamanders and lizards appear Flying reptiles (pterosaurs) Bipedal predators and Quadruple herbivores Emergence of Flowering plants First birds appear

12. Mesozoic Era: Cretaceous MASS EXTINCTION ~76% of species extinct Meteorite crashes into Yucatan pennusila Known as K-T impcact Dinosaurs were wiped out

13. Cenozoic: Tertiary

14. Cenozoic: Quaternary (Present period)

15. Conclusion Life Began 3.8 bya Cambrian Explosion 534 mya There have bee 5 Mass Extinctions on our Planet 99% of all species on our planet have gone extinct 75% 96%65%76%

16. Thank you…..Questions?