| A | B |
|---|
| adaptation | characteristic that improves an organisms ability to survive |
| species | group of organisms that can produce fertile offspring |
| evolution | process in which inherited characteristics change over time |
| fossil record | historical sequence of life through fossils |
| trait | genetically determined characteristic |
| selective breeding | human practice of breeding organisms |
| natural selection | process by which organisms that are better adapted survive and reproduce |
| generation time | period between birth of one generation and the birth of the next |
| speciation | formation of new species from evolution |
