| A | B |
|---|
| naturalist | a scientist who studies living things in nature |
| natural selection | process in which organisms with characteristics best suited for the environment survive, reproduce, and pass these traits to their offspring |
| unique | different from anything else; one-of-a-kind |
| adapted | made fit to live under certain conditions |
| opposition | an action or belief against something |
| thrive | to do well, to be successful, healthy, or strong |
| evolution | process of change over a period of time |
| overproduction | organisms produce more offspring than could possibly survive |
| competition | contest between organisms for limited resources |
| survive | to stay alive or in existence |
| variation | differences in traits among individuals of a species |
| struggle | an enormous effort or attempt; a battle |
| limited | to be restricted, not to be able to have more |
| genes | segment of DNA that specifies a trait |
| resources | supplies that will meet a need |
| adaptations | the behaviors and physical characteristics of species that allow them to live successfully in their environment |
| confrontation | the clashing of forces or ideas |
| allele | different form of the same gene |
| mutations | a change in a chromosome or gene |
| inherited | the passing of characteristics from parents to offspring |
