| A | B |
|---|
| habitat | the environment where a species lives |
| niche | the role of an organism in its environment |
| realized niche | the actual niche of an organism |
| fundamental niche | the theoretical niche of an organism |
| predator | an organism that actively hunts another organism |
| prey | an organism that is hunted |
| commensalism | when two species live together and neither is harmed |
| evolution | a change in populations of organisms over time |
| parasitism | when one organism feeds off the body of another organism |
| symbiosis | when two species live together closely |
| mutualism | when two species live together and one benefits and the other is not harmed |
| lichen | a fungus and an alga living together |
| primary succession | the formation of a community where life did not exist |
| secondary succession | the formation of a community where a disturbance has occured |
