| A | B |
|---|
| Fossils | Remains of once living organisms |
| Fitness | Ability to survive and reproduce |
| Adaptation | Inherited characteristic aiding survival |
| Natural Selection | Another name for survival of the fittest |
| Survival of the Fittest | Better adapted organisms survive and reproduce |
| Descent with Modification | Species change over time to become new species |
| Homologous Body Structures | Develop differently - but from the same embryonic tissue |
| Vestigial Organs | Leftover traces of homologous structures |
