| A | B |
| symbiosis | close relationship between 2 species that benefits at least one species |
| host | the organism that a parasite lives in or on; parasitism |
| natural selection | process by which individuals that are better adapted to the envrionment are more likely to survive or reproduce than others |
| parasitism | the relationship in which one organism lives on or inside another and HARMS it. |
| niche | an organisms particular role in an ecosystem; or how it makes its living |
| commensalism | a relationship between two species in which one species benefits and the other is neither helped or harmed |
| predator | the organism that does the killing and predation |
| prey | an organism that is killed in predation |
| predation | an interaction in which one organism kills and eats another |
| mutualism | a relationship in which both species benefit. |
| adaptation | the behaviors & physical characteristics of a species that allow it to live successfully in its environment |