| A | B |
|---|
| natural selection | organisms best suited to their environment reproduce more successfully |
| population | all the members of a species that live in the same area and make up a breading group |
| uniformitarianism | the geological structure of earth resulted from cycles of obseravable process and that these same processes operate continuously through time |
| adaptation | hertiable characteristic that increases an organism's ability to survive and reproduce |
| fitness | descirbes how well an organism can survive and reproduce in its environment |
| principle of common descent | all species - living and extinct-are descended from ancient common ancestors |
| competition | individuals in a species compete for resources |
| variation | differences within individuals within a species |
| evolution | changes within the genetic makeup of a population over time |
| Charles Darwin | developed a theory that explained how modern species evolved from a common ancestor |
| speciation | formation of new species |
| reproductive isolation | two populations no longer interbreed |
| Behavioral isolation | two populations that are capable of interbreeding develop differences in courtship rituals and other behaviors |
| Geographic isolation | populations separated by barriers (rivers, mountains, streams) |
| Temporal isolation | two or more species reproduce at different times |
