| A | B |
|---|
| adaptation | The behaviors and physical characteristics of species that allow them to live successfully in their environments |
| niche | An organism's particular rol in an ecosystem, or how it makes its living. |
| competition | The struggle between organisms for the limited resources in a habitat. |
| predation | an interaction in which one organism kills and eats another. |
| predator | The organism that does the killing in predation. |
| prey | The organism that does the killing in predation. |
| symbiosis | A close relationship between species that benefits at least one of the species. |
| mutualism | A relationship between two species in which both species benefits. |
| 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 inside another and harms it. |
| parasite | The organisms that benefits by living on or in a host in parasitism. |
| host | The organism that a parasite live in or on in parasitism. |
