| A | B |
|---|
| adaptation | structure, behavior, or function that allows an organism to live in a specific area |
| mutation | change in DNA code |
| unfavorable mutation | a change that does not improve or hurts a species |
| favorable mutation | change improves species that helps an organism to survive |
| variation | trait that makes an individual different than others of its kind |
| sexual reproduction | male and female both donate genetic information to create an offspring |
| asexual reproduction | when an organism splits and divides to create another organism |
| four changes in environment to bring about differences in an organism | adaptation, natural selection, extinction, and mutation |
| fossils | once living organisms |
| sedimentary rock | where fossils are often found |
| oldest fossils are found in... | ...the deepest layers of sediment |
| natural selection | process by which organisms that are best adapted to their environment survive, reproduce and pass traits on to the next generation |
| extinction | when a species dies out due to lack of survival traits |
