| A | B |
| taxonomy | science of classifying organisms |
| genus | group of similar species |
| species | group of organisms that can interbreed and produce fertile offspring |
| kingdom | group of similar phyla of organisms |
| division | substitute for phyla in classification of bacteria, fungi and plants |
| scientific name | 2-word name given to each organism |
| family | group of closely related genera |
| order | collection of similar families of organisms |
| class | collection of similar orders of organisms |
| phylum | similar classes of Monerans, Animalia, or Protista |
| convergent evolution | unrelated organisms evolve similar features |
| analogous characters | similar features that evolved independently |
| derived characters | unique characteristic that defines a group of organisms |
| cladograms | branching tree diagram showing evolutionary relationships |
| phenetics | system of classification based on overall similarities |
| cladistics | system of classification that attempts to determine evolutionary relationships |
| hybrid | offspring of two different species |