| Term | Definition |
| Population | Consists of all the individuals of a species that live together at one time |
| Natural Selection | Process by which populations change in respond to there environment as individuals better adapt to the environment leave more offspring then those individuals not suited to the environment |
| Adaption | Process of becoming adapt to an environment and anatomical structure physiological process, or behavioral trait that improves and organism likelihood of several and reproduction |
| Isolation | Is the condition in which to populations of the same species can not breed with one another |
| Paleontologists | Scientist who studies fossils |
| Vestigial Structure | Structure reduce in size and function consider to be evidence of an Organisms evolutionary past |
| Homologous Structure | Are Structures that share a common ancestry |
| Gradualism | Model of evolution and which gradual change over a long period of time leads to species formation |
| Punctuated Equilibrium | Model of Evolution in which short periods of rapid change in species are separated by long periods of little or no change |
| Industrials Melanism | Darkening of populations of organisms over time in response to industry pollution |
| Divergence | accumulation of differences between groups can lead some to the formation of new species |
| Speciation | Process by which new species are formed |
| Ecological Races | Population of species that differs genetically because adaption to different living conditions |
| Reproductive Isolation | is the inability interbreeding groups to mate or produce fertile |