| A | B |
|---|
| evolutionary tree | shows common ancestry |
| adaptation | trait that enables an organism to better survive in its environment |
| natural selection | Darwin's theory of evolution |
| use and disuse | Lamarck's theory of evolution |
| fitness | an organisms ability to survive and reproduce |
| sexual reproduction & mutations | needed for natural selection to occur |
| evolution | gradual change in a population over time |
| population | group of similar species |
