| A | B |
|---|
| natural selection | a process by which individuals that are better adapted to their environment are more likely to survive and reproduce than others of the same species |
| adaptation | a behavior or physical characteristic that allows an organism to survive or reproduce in its enviornment |
| niche | the role of an organism in its habitat or how it makes a living |
| competition | the struggle between organisms to survive as they attempt to use the same limited resource |
| predation | an interaction in which one organism kills another for food |
| symbiosis | a close relationship between two organisms of different species that benefits at least one of the organisms |
| predator | the organism that does the killing in a predation interaction |
| prey | an organism that is killed and eaten by another organism |
| mutualism | a close relationship between organisms of two species in which both organisms benefit |
| commensalism | a relationship between two species in which one species benefits and the other is neither helped nor harmed |
| parasitism | a relationship in which one organism lives on or in a host and harms it |
| host | the organism that a parasite or virus lives in or on |
| parasite | the organism that benefits by lving on or in a host in a parasitism interaction |
