| A | B |
| classify | to put similar organisms in groups |
| phylogeny | an organism's evolutionary history |
| genus | group of different, similar species |
| species | most specific classification category |
| animals | kingdom whose many-celled organisms cannot make their own food |
| species diversity | the great variety of plants and animals |
| dichotomous | key that helps identify organisms |
| kingdom | most general classification category |
| phylum | the second-highest of the taxonomical categories in the animal kingdom |
| division | largest grouping in the plant kindgom |
| class | the third-highest taxonomical category, below the phylum or division |
| order | the fourth-highest taxonomical category, below the class |
| family | the fifth highest taxonomical category, below an order |
| plant | kingdom whose organisms make their own food and do not move |
| taxonomy | science of grouping and naming organisms |
| binomial nomenclature | system of naming organism with two names |
| prokaryotes | cells without organelles or a nucleus |