| A | B |
|---|
| Competition | the struggle between organisms to survive as they attempt to use the same limited resources |
| Predation | one organism kills another organism for food |
| Predator | organism that does the killing |
| Prey | organism that is hunted and killed |
| Symbiosis | interactions between two species when at least one organism benefits |
| Commensalism | one species benefits and the other is neither harmed nor helped |
| Parasitism | one species benefits (parasite) and the other is harmed (host) |
| parasite | benefits from the relationship |
| host | harmed from the relationship |
| Mutualism | beneficial to both species |
| Primary succession | is the series of changes that occur in an area where no soil or organisms exist |
| Secondary succession | is the series of changes that occur in an area where the ecosystem has been disturbed, but the soil and the organisms still exist |
| competition, predation, symbiosis | three types of relationships living things can have with each other |
| mutualism, commensalism, parasitism | three types of symbiotic relationships |
