| A | B |
|---|
| coevolution | Back-and-forth evolutionary adjustments between interacting members of an ecosystem |
| predation | Occurs when one organism feeds on another |
| parasitism | When one organism lives on another, but usually not killing it |
| secondary compounds | defensive chemicals that virtually all plants have |
| competition | When two species use the same resource |
| symbiosis | when two or species live together live in a close, long-term relationship |
| mutualism | When both organisms benefit from the sybiosis |
| commensalism | When one species is helped and the other is not harmed or helped by the symbiosis |
| niche | The role of an organism in an ecosystem |
| fundamental niche | The total niche an organism is potentially able to occupy |
| realized niche | The part of the fundamental niche that the organism occupies |
| character displacement | increased difference when competitive organisms live together |
| competitive exclusion | local elimination of one ocmpeting species |
| Principle of competitive exclusion | states that if two species are competeing, the species that uses the resources will eliminate the other |
| plankton | consists mostly of microscopic organisms, including bacteria, algae, fish larvae, and other small animals |
