| A | B |
|---|
| relative data | dating method that compares specimen to other fossils around it or to an an index fossils |
| radioactive dating | measure amount of radioactive isotope to determine age of s |
| paleontologist | scientist who study fossils |
| fossil | evidence of past life |
| era | major time divisions on geologic time scale |
| period | division within an era |
| microfossil | microscopic fossils |
| Miller and Urey | scientists who set up experiment to test oparin belief |
| half life | amount of time it takes 1/2 the specimen to undergo radioactive decay |
| geologic time scale | scale used by paleontologists to represent evolutionary time |
