| A | B |
| taxonomy | naming & grouping of organisms based on characteristics & evolutionary history |
| scientific name | name given to organisms by scientists; Latin; same worldwide |
| dichotomous key | tool used to determine the scientific name of an organism |
| Fossils | Remains of once living organisms |
| Fitness | Ability to survive and reproduce |
| Adaptation | Inherited characteristic aiding survival |
| Survival of the Fittest | Better adapted organisms survive and reproduce |
| Descent with Modification | Species change over time to become new species |
| Evolution | Change over time |
| Artificial selection | Humans breed organisms with desired traits |
| natural selection | environment selects organisms with desired traits |
| Genus | A group of closely related species |
| Domain | Newest and largest classification category |
| Family | Group of genera (pl. of genus) that share many characteristics |
| Genus and species | Two parts of a scientific name |
| Order | Group of similar families |
| Taxon | Group into which organisms are classified |
| Class | Group of closely related orders |