| A | B |
|---|
| evolution | Changes to inherited characteristics over time |
| fossil | the remains or impression of a prehistoric organism preserved in rock |
| homologous structures | Body parts that are similar in origin and function; |
| vestigial structures | structures that don't seem to provide a function. |
| extinction | the disappearance of a species |
| mutation | permanent changes to inherited traits |
| common descent | evoution from connon ancestors |
| adaptations | variations making making an organism more suited to its environment. |
