| A | B |
|---|
| Evolution | Change over time |
| Artificial selection | Humans breed organisms with desired traits |
| Vestigial organs | Structures in an organism left over from an ancestor |
| Survival of the fittest | Individuals best suited to their environment live and reproduce best |
| Adaptation | Inherited characteristic that increases an organism’s chance of survival |
| Common descent | Idea that all species have evolved from shared ancestors |
| Fitness | The ability to survive and reproduce in a specific environment |
| Homologous | Structures different in adult forms but develop from the same embryonic tissues |
| Fossils | The preserved remains of once-living organisms |
| Descent with modification | Shared ancestor becomes different species |
