1. An ecosystem in which the biotic and abiotic features remain constant is in ______________.

2. The series of changes over time after a natural disaster is called ________________.


3. _____________________ is the removal of most of the trees in a forest ecosystem.


4. The process of removing mature trees but leaving younger ones is ___________________.


5. __________________ involves taking responsibility for protecting the environment.


6. Acid precipitation is caused by the chemicals nitrogen oxides and _____________________.


7. Non-native organisms that have a negative impact on ecosystems are __________________.


8. ___________________ such as the Hilliardton Marsh are important aquatic ecosystems.


9. The process of breaking up large ecosystems into smaller parts is ____________________.


10. _________________ species like the barn owl are at risk of becoming extinct.