| A | B |
|---|
| adaptation | a change in characteristics that helps an organism survive |
| example of an adaptation | fur on bottom of feet to survive in snow |
| species | group of organisms that can mate with one another and produce fertile offspring |
| evolution | the process in which populations inherit changes over time |
| example of evolution | today's human stands erect and is taller than cave man |
| fossils | solidified remains or imprints of once-living organisms |
| example of fossils | tiny mollusks imprints found in stone in Himalayas |
| fossil record | historic sequence of life provided by fossils |
| Fossils found deeper are | older |
| Gaps in fossil records because | not all organisms left imprints |
| vestigial structures | remnants of once useful organs or body parts |
| example of a vestigial structure | your appendix |
