| Term | Definition |
| climax community | a stable, mature community that has had little or n change |
| equilibrium | when an ecosystem's population is balanced. there are no drastic changes in the population |
| pioneer species | first species to populate an area during primary succession |
| primary succession | an ecological succession that begins in a an area where no biotic community previously existed |
| secondary succession | the series of changes that occur after a disturbance of an existing ecosystem |
| succession | (ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established |