Notes

1. Development of ____ factored in the development of complex organisms
~Answer: D. All of the above. (ozone, oxygen, cyanobacteria)
2. Life-forms that existed during the Paleozoic Era included ___.
Answer: D. All of the above (fish, trilobites, reptiles)
3. The formation of the moon may have caused the Paleozoic Extinction
~Answer: FALSE
4. The geological time scale is divided up and organized according to what life forms existed on earth.
~Answer: TRUE
5. Early land animals had to return to the water to reproduce
~Answer: TRUE
6. Animal life in the Paleozoic Era included all of the following EXCEPT ____.
~Answer: B. Humans
7. The change in environments that may have occurred at the end of the Paleozoic Era may have been caused by ____.
~Answer: C. Plate Tectonics
8. Cyanobacteria increased the levels of carbon dioxide in the atmosphere
~Answer: FALSE
9. The ____ formed during the Paleozoic Era
~Answer: c. Appalachian Mountains
10. What time period lasted for more than half of the hypothesized history of the Earth?
~Answer: D. Precambrian
11. During the Archean age, what kind of rock covered the surface of the Earth?
~Answer: B. Igneous
12. The Precambrian time period is the largest on the geological time scale.
~Answer: TRUE
13. Early land animals had gills as well as lungs
~Answer: TRUE
14. A life form in the Precambrian time was ____.
~Answer: A. Cyanobacteria
15. Little is known about much of the Earth's early history because ___.
~Answer: d. All of the above (precambrian rocks have been deeply buried, precambrian rocks have been changed by heat and pressure, precambrian soft-bodied life-forms weren't often preserved as fossils)