| A | B |
| binomial nomeclature | two-word naming system that provides every organism with its own scientific name |
| class | third-highest taxonomic category, below phylum (animals) or division (plants) |
| dichohotomous key | a detailed list of traits used to identify a specific organism |
| division | second-highest taxonomic category in plant and fungi kingdoms (in the animals kingdom, phylum replaces divion) |
| family | the fifth-highest taxonomic category, below an oder. |
| genus | a group of different organisms with simiar characteristics; can have one or more species |
| kingdom | the highest an largest of the taxonomic categories; kingdoms include all other categories |
| order | the fourth-highest taxonomic category, below a class |
| phylogeny | the evolutionary histroy of an organism |
| species | a group of organisms whose members successfully reproduce among themselves |
| species diversity | the great variety of plants, animals, and other organisms on Earth |
| taxonomy | the science of classifing and naming organisms |
| phylum | the second-highest taxonomic category in the animal kingdom |