| A | B |
|---|
| adaptation | structure, behavior or other trait that helps an organism survive |
| classification | to organize into groups of similar characteristics |
| extinct | no more living members of a species |
| evolutionary tree | branching timeline of change or growth of a new species over time |
| fossil | remains, impressions, tracks or other evidence of ancient organisms |
| law of superposition | states that fossils found in deeper layers are older than ones above |
| natural selection | process by which organisms change over time |
| pedigree | a family tree that shows genetic traits and how they are passed on from one generation to the next |
| radioactive dating | process of using relative amounts of radioactive elements (C 14) remaining in a fossil to determine its age |
| scientific name | the genus and species of an organism (homo sapiens- human) |
| species | group of organisms that can mate and produce offspring |
