Pre-AP Ch. 18
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| 7548340 | taxonomy | discipline of classifying organisms and assigning each organism a universally accepted name | |
| 7548341 | binomial nomenclature | a classification system in which each species is given a two part scientific name | |
| 7548342 | genus | group of closely related species, first part of its bionomial nomenclature | |
| 7548343 | taxon | group or level of organization into which organisms are classified | |
| 7548344 | family | group of genera that share many characteristics | |
| 7548345 | order | group of similar families | |
| 7548346 | class | group of similar orders | |
| 7548347 | phylum | group of closely related classes | |
| 7548348 | kingdom | large taxonomic group, consisting of closely related phyla | |
| 7548349 | phylogeny | the study of evolutionary relationships among organisms | |
| 7548350 | evolutionary classification | method of grouping organisms together according to their evolutionary history | |
| 7548351 | derived character | characteristics that appear in recent parts of a lineage but not in its older members | |
| 7548352 | cladogram | diagram that shows the evolutionary relationships among a group of organisms | |
| 7548353 | molecular clock | model that uses DNA comparison to estimate the length of time that two species have been evolving independently | |
| 7548354 | domain | most inclusive taxonomic category; larger than a kingdom | |
| 7548355 | Bacteria | domain of unicellular prokaryotes that have cell walls containing peptidoglycan | |
| 7548356 | Eubacteria | kingdom of unicelluar prokaryotes whose cell walls are made up of peptidoglycan | |
| 7548357 | Archaea | domain of unicellular prokaryotes that have cell walls that do not contain peptidoglycan | |
| 7548358 | Archaebacteria | kingdom of unicellular prokaryotes that have cell walls that do not contain peptidoglycan | |
| 7548359 | Eukarya | domain of all organisms whose cells have nuclei including protists, plants, fungi and animals | |
| 7548360 | Protista | Kingdom composed of eukaryotes that are not classified as plants, animals, or fungi | |
| 7548361 | Fungi | Kingdom composed of heterotrophs; many obtain energy and nutrients from dead organic matter | |
| 7548362 | Plantae | Kingdom of multicellular photosynthetic autotrophs that have cell walls containing cellulose | |
| 7548363 | Animalia | Kingdom of multicellular eukaryotic heterotrophs whose cells do not have cell walls |