| A | B |
|---|
| ecosystem | all living and non-living things in an area |
| niche | the role a population has in an ecosystem |
| population | amount of one type of organism in an area |
| community | all of the populations for an area |
| symbiosis | then two different species have a relationship |
| estuary | where rivers flow into ocean |
| extinction | when a species has no member of its kind alive |
| adaptation | how a species changes to fit its ecosystem better |
