| A | B |
|---|
| extinction | end of an evolutionary line or the end of a species, family, or larger group of organisms |
| fossil | physical evidence of an organism that lived long ago |
| fossil record | collection of fossils that represents the preserved history of living things on earth |
| vestigial structures | a type of homologous structure that is no longer used as it is in most other organisms that have it |
| species | a group of organisms that can breed with one another and produce fertile offspring in a natural environment |
| biological evolution | change in populations of living organisms on planet Earth through time |
| natural selection | the explanation for evolutionary change proposed by Darwin and Wallace |
| artificial selection | another name for selective breeding |
| variation | natural differences in a species |
| extinction | all members of a species have died |
