| A | B |
|---|
| natural selection | a process by which individuals that are better adapted to their environment are more likely to survive and reproduce than others of the same species. |
| niche | the role of an organism in its habitat, or how it makes its living. |
| succession | the series of predictable changes that occur in a community over time. |
| primary succession | the series of changes that occur in an area where no soil or organisms exist. |
| secondary succession | the series of changes that occur in an area where an ecosystem has been disturbed, but where soil and organisms still exist. |
| pioneer species | the first species to populate an area. |
