2. CHOICES: PrecambrianPaleozoicMesozoicCenozoic 1. Which era contains the Cambrian Explosion? 2. Which era did eukaryotes evolve? 3. Which era ends with largest mass extinction in history? 4. Which era did mammals and birds first evolve? 5. Which era had periodic ice ages and land bridges connecting the continents? 6. Which era did Miller/ Urey try to recreate the atmosphere to in their experiment? 7. Which era has life moving from the sea to the land? 8. Which era did Pangaea exist and then break up? 9. Which era did grasses and large grazing mammals evolve? 10. Which era did prehistoric humans exist?

3. 1. Paleozoic Era 2. Precambrian Time 3. Paleozoic Era 4. Mesozoic Era 5. Cenozoic Era 6. Precambrian Time 7. Paleozoic Era 8. Mesozoic Era 9. Cenozoic Era 10. Cenozoic Era

4. Directions: Complete each statement with a phrase. 1. Cyanobacteria created __________________. 2. The ozone layer lead to _______________________. 3. The evolution of land plants lead to _______________. 4. The extinction of the dinosaurs lead to _____________. 5. Water vapor from volcanoes and comets lead to _________________. 6. Lobed-fin fish with lungs lead to ________________. 7. The Cambrian explosion created __________________. 8. The evolution of grasses lead to __________________.

5. 1. Cyanobacteria created oxygen in the atmosphere. 2. The ozone layer lead to protection of harmful UV rays OR life moving onto land. 3. The evolution of land plants lead to the evolution of animals on land. 4. The extinction of the dinosaurs lead to the “Age of the Mammals” OR mammals dominating the fossil record. 5. Water vapor from volcanoes and comets lead to the formation of the oceans. 6. Lobed-fin fish with lungs lead to the first vertebrates on land (amphibians). 7. The Cambrian explosion created All of the major animal groups of today. 8. The evolution of grasses lead to large grazing mammals.

6. Directions: For the following Sequence Sets (#1 -5), place the events in order from oldest to most recent. SET #1 A. START OF MESOZOIC ERA B. START OF PRECAMBRIAN TIME C. GREATEST MASS EXTINCTION (90% OF ALL LIFE) D. START OF CENOZOIC ERA E. DINOSAUR MASS EXTINCTION F. START OF PALEOZOIC ERA

7. SET #1 B. START OF PRECAMBRIAN TIME F. START OF PALEOZOIC ERA C. GREATEST MASS EXTINCTION (90% OF ALL LIFE) A. START OF MESOZOIC ERA E. DINOSAUR MASS EXTINCTION D. START OF CENOZOIC ERA

8. SET #2 A. EARLIEST BACTERIA (PROKARYOTES) B. EARLIEST MULTICELLULAR ORGANISMS C. EARLIEST PHOTOSYNTHETIC BACTERIA (CYANOBACTERIA) D. ATMOSPHERE SIMILAR TO MILLER-UREY EXPERIMENT E. EARLIEST EUKARYOTES (CELLS WITH A NUCLEUS) F. INVERTEBRATES WITH HARD PARTS (EXOSKELETONS)

9. SET #2 D.ATMOSPHERE SIMILAR TO MILLER-UREY EXPERIMENT A.EARLIEST BACTERIA (PROKARYOTES) C.EARLIEST PHOTOSYNTHETIC BACTERIA (CYANOBACTERIA) E.EARLIEST EUKARYOTES (CELLS WITH A NUCLEUS) B.EARLIEST MULTICELLULAR ORGANISMS F.INVERTEBRATES WITH HARD PARTS (EXOSKELETONS)

10. SET #3 A.INVERTEBRATES ON LAND B.INVERTEBRATES FROM THE CAMBRIAN EXPLOSION C.PLANTS ON LAND D.OZONE LAYER E.JAWLESS FISH (1 st vertebrates) F.FIRST AMPHIBIANS

11. SET #3 B.INVERTEBRATES FROM THE CAMBRIAN EXPLOSION E.JAWLESS FISH (1 st vertebrates) D.OZONE LAYER C.PLANTS ON LAND A.INVERTEBRATES ON LAND F.FIRST AMPHIBIANS

12. SET #4 A.DINOSAURS & MAMMALS B.REPTILES C.FLOWERING PLANTS (ANGIOSPERMS) D.LARGE MAMMALS & GRASSES E.PREHISTORIC HUMANS (HOMINIDS)

13. SET #4 B.REPTILES A.DINOSAURS & MAMMALS C.FLOWERING PLANTS (ANGIOSPERMS) D.LARGE MAMMALS & GRASSES E.PREHISTORIC HUMANS (HOMINIDS)

14. SET #5 A.GREAT ICE AGE & LAND BRIDGES B.COAL DEPOSITS OF PENNSYLVANIA C.NO OXYGEN IN ATMOSPHERE D.PANGAEA E.GIANT METEOR IMPACT IN MEXICO F.OZONE LAYER FORMS

15. SET #5 C.NO OXYGEN IN ATMOSPHERE F.OZONE LAYER FORMS B.COAL DEPOSITS OF PENNSYLVANIA D.PANGAEA E.GIANT METEOR IMPACT IN MEXICO A.GREAT ICE AGE & LAND BRIDGES