| A | B |
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| classification | the arrangement of organisms into orderly groups based on their similarities and presumed evolutionary relationships |
| kingdoms | the largest, most general group in classification |
| phylum | the level of classification after kingdom |
| class | the level of classification after phylum |
| order | the level of classification after class |
| family | the level of classification after order |
| genus | the level of classification after family |
| species | the most specific of the seven levels of classification characterized by organisms that can mate with one another to produce offspring |
| taxonomy | the science of identifying, classifying and naming living things |
| dichotomous key | an aid used in identifying unknown organisms consisting of several pairs of descriptive statements; only one will apply to the organism and the other will lead to the next set of statements |
| Archaebacteria | a classification kingdom containing bacteria that live in extreme conditions |
| Eubacteria | a classification kingdom containing mostly free-living bacteria found in many varied organisms |
| Protista | a kingdom of eukaryotic single-celled or simple, multicellular organism; contains all eukaryotes that are not plants, animals and fungi |
| Plantae | the kingdom that contains plants; complex, multicellular organisms that are green and use the sun's energy to make sugar by photosynthesis |
| Fungi | a kingdom of complex organisms that obtain food by breaking down other substances in their surroundings and absorbing nutrients |
| Anamalia | the classification kingdom containing complex, multicellular organisms that lack cell walls, are usually able to move around, and possess nervous systems that help them be aware of and react to their surroundings |
