2. In what Era can the oldest fossils be found? a. Cenozoic c. Mesozoic b. Paleozoic d. Pre-Cambrian 3. What is the method used by the Paleontologist to determine the age of the fossils by using the decay or radioactive isotopes present in rocks? a. Relative dating b. carbon-14 dating c. geologic time scale d. fossil records 4-What organism was the first living thing that existed on earth? a. trilobite b. blue green algae c. vascular plants d. man 5.Which of the following is the importance of fossil records? a. Fossils provide evidence that organisms are not the same as of today. b. Fossils show a progression of evolution. c. Fossils do not show any evidence for evolution. d. A and B