| A | B |
| Taxonomy | the science of grouping organisms according to their presumed natural relationships |
| Common names | the everyday given names to organisms |
| Genus | a large group of similar species |
| Family | a similar genera of organisms |
| Order | similar families placed |
| Class | similar orders placed |
| Phylum | similar classes placed |
| Kingdom | two groups, the plant and animal, that a phylum is placed in |
| Binomial nomenclature | a naming system meaning two names |
| Scientific name | the binomial name of a species |
| Division | Botanists use this term in place of phylum when classifying plants |
| Phylogeny | the evolutionary history of a species |
| Dichotomous key | a written set of choices that leads to the name of an organism |
| Phylogenetic tree | a visual model of the inferred evolutionary relationships among organisms |
| Biosystematics | a form of taxonomy that examines reproductive compatibility and gene flow |