| A | B |
|---|
| species | a group of organisms with similar characteristics that can reproduce and produce fertile offspring |
| natural selection | the survival of the fittest: the organisms that have adapted the best are the ones that will survive and reproduce |
| variation | inherited trait that makes an individual different from other members of the species |
| extinction | process by which a species is no longer able to survive |
| mutations | inherited changes that may or may not help a species to survive |
| adaptation | structural or behavioral change that helps an organism survive |
| biodiversity | the species variety and balance in an ecological community |
| evolution | change in inherited characteristics over time |
