| Term | Definition |
| Food | All species reproduce at a faster rate than their food supply |
| Variety | All living things vary |
| Can | There is competition for resources |
| Attract | Individuals with favorable variation or traits will have an advantage in the struggle for survival |
| Enormous | Only the environment determines the best adaptations |
| Ho's | Favorable traits needed for adaptation are heritable and passed on |
| Don't | Over long period of time, differential inherritance may lead to a new species |
| Isolate | Isolation leads to speciation |