| A | B |
| prey | the organism that is hunted and eaten by another animal |
| predator | the organism that hunts and kills other animals for food |
| adaptation | a trait, or characteristic, that helps an organism survive |
| host | the organism that is harmed by an organism living in or on it |
| parasite | the organism that lives in or on another organism and harms it |
| parasitism | a type of symbiosis in which one organism lives on or inside another and harms it |
| mutualism | a type of symbiosis in which both partners benefit from living together |
| commensalism | a type of symbiosis in which one organism benefits and the other is not affected |
| competition | a fight or struggle between organsisms over limited resources |
| predation | an interaction between organisms when one kills another for food |