| A | B |
| Competition | The use or defense of a resource |
| Intrapspecific Competition | Competition with the same species |
| Interpspecific Competition | Competition with different species |
| Competitive Exclusion Principle | 2 Competitors cannot coexist on teh same limited resource |
| Predation | 1 organism feeds on another |
| Symbiosis | 2 dissimular organisms live together with a close relationship |
| Paratism | One organism gets nutrition from the other |
| Parasite | Organism receiving nutrition in paratism |
| Host | Organism giving nutrition in paratism |
| Commensalism | One orgaism benefits while the other gets nothing positive or negative |
| Epiphytes | Plants that grow on other plants |
| Mutualism | Both organisms benefit from their relationship |