| A | B |
|---|
| commensalism | a form of symbiosis in which one member of the relationship benefits and the other is neither helped nor harmes |
| mutualism | a form of symbiosis in which both maembers of the relationship benefit |
| predation | relationship in which one organism feeds on another organism |
| competition | a relationship in which organisms compete for resources |
| keystone predator | a predator that keeps the population of certain organisms down, preventing overpopulation |
| producer | plants, algae and green bacteria that make their rown food from sunlight |
| herbivore | consumers that eat only plants |
| carnivore | consumers that eat only other consumers or animals |
| decomposers | some fungus, protists, and bacteria that play a vital role in every biogeochemical cycle |
