1. THE HISTORY OF LIFE EARLY HISTORY OF EARTH EVIDENCE HOW OLD IS SOMETHING? WHAT IS GEOLOGIC TIME? FIRST CELLS ENDOSYMBIONT THEORY Courtesy NASA/JPL-Caltech http://origins.jpl.nasa.gov/habitable-planets/invest16.html

2. WHAT DO YOU THINK EARLY EARTH WAS LIKE? HOW OLD? 4.5 BILLION YEARS BIG BANG - GRAVITY CAUSES DUST PARTICLES TO CONDENSE METEORS FOR MILLIONS OF YEARS

3. EARTH HAS TO COOL DOWN - STEAM ESCAPES AND RAIN ALLOWS COLLECTION OF WATER WHAT DO YOU THINK EARLY EARTH WAS LIKE? EARTH NOW HAS……ATMOSPHERE OF AMMONIA, METHANE, WATER VAPOR, CO2, AND NITROGEN

4. THE HISTORY OF LIFE EVIDENCE

5. WHAT EVIDENCE DO SCIENTISTS USE? FOSSILS! –TRACE –MOLD –CAST –AMBER

6. WHERE ARE FOSSILS USUALLY FOUND? WHO STUDIES THESE? HOW DO SCIENTISTS DETERMINE THE AGE OF SOMETHING BILLIONS OF YEARS OLD?

7. RELATIVE DATING RADIOMETRIC DATING WHERE ARE FOSSILS USUALLY FOUND?

9. Relative Dating

10. THE HISTORY OF LIFE WHAT IS GEOLOGIC TIME? FIRST CELLS ENDOSYMBIONT THEORY

11. GEOLOGICAL TIME TOO OLD FOR YEARS OR MONTHS FOUR ERAS DEPENDING ON WHICH ORGANISMS LIVED

12. PRECAMBRIAN PALEOZOIC MESOZOIC CENOZOIC GEOLOGICAL TIME

13. WHY DO WE HAVE DIFFERENT ERA’S? Image courtesy of the UC Museum of Paleontology Understanding Evolution: http://evolution.berkeley.edu."

14. PRECAMBRIAN WHAT DO SCIENTISTS THINK WAS ALIVE WAY BACK THEN?? BACTERIA THIS ERA LASTED FOR BILLIONS OF YEARS UNTIL MORE LIVING ORGANISMS EVOLVED

15. PALEOZOIC ERA 540 MILLION YEARS AGO!! NOW THE EARTH IS GETTING LARGER LIFE! FIRST PART OF PALEOZOIC IS CALLED CAMBRIAN PROTISTS! SEA PLANTS! Dr. Thomas W. Kammer

16. PALEOZOIC ERA 540 MILLION YEARS AGO!! SEA ANIMALS! LAND PLANTS! LAND ANIMALS! WHAT ENDED THE PALEOZOIC ERA?? MASS EXTINCTION!

17. MESOZOIC ERA 245 MILLION YEARS AGO!! DINOSAURS REPTILES SMALL MAMMALS APPEAR BIRDS EVOLVE

18. MESOZOIC ERA 245 MILLION YEARS AGO!! PLATE TECTONICS WHAT ENDED THE MESOZOIC ERA? MASS EXTINCTION! ? METERORITE

19. CENOZOIC ERA 66 MILLION YEARS AGO! MAMMALS FLOURISH PRIMATES ABOUT 30 MILLION YEARS AGO MODERN HUMAN SPECIES – ABOUT 200,000 YEARS AGO

20. THE HISTORY OF LIFE FIRST CELLS ENDOSYMBIONT THEORY Courtesy NASA/JPL-Caltech http://origins.jpl.nasa.gov/habitable-planets/invest16.html

21. HOW WERE THE FIRST CELLS MADE? DOES ANYONE KNOW FOR SURE? SPONATEOUS GENERATION VS BIOGENESIS FRANCESCO REDI LOUIS PASTEUR’S EXPERIMENT

22. LOUIS PASTEUR

23. LP Pasteur filled a flask with medium, heated it to kill all life, and then drew out the neck of the flask into a long S.

24. LP This prevented microorganisms in the air from entering the flask Allowed air to flow freely. If the swan neck was broken, microbes could enter the flask and grow.

25. ALEXANDER OPARIN - CREATION OF MACROMOLECULES WITHOUT OXYGEN STANLEY MILLER AND HAROLD UREY EXPERIMENT

26. FIRST BACTERIA AROUND 3.5 BILLION YEARS AGO ONE CELL ORGANISMS NOW!

27. SOME ARE CYANOBACTERIA - THESE ARE PHOTOSYNTHETIC BACTERIA - HMMMMMMM WHAT ARE THESE BACTERIA GOING TO PRODUCE? ONE CELL ORGANISMS NOW!

28. ALMOST 10% ABOUT 2.5 BILLION YEARS AGO WHAT TYPE OF CELLS ARE BACTERIA?

29. WHAT TYPE OF CELLS ARE ALL OTHER ORGANISMS? WHERE DID EUKARYOTIC CELLS COME FROM? ENDOSYMBIOSIS

30. THE HISTORY OF LIFE ENDOSYMBIONT THEORY Proposed by Lynn Margulis in 1960 Courtesy NASA/JPL-Caltech http://origins.jpl.nasa.gov/habitable-planets/invest16.html

31. ENDOSYMBIOSIS BEGINNING OF THE EUKARYOTIC CELLS EVIDENCE FOR ENDOSYMBIOSIS DNA