science

8. abundant species in a community
9. happens when a new patch of land is created or exposed for the first time
11. species that has a disproportionately large effect on its natural environment relative to its abundance
12. likely to become extinct in the near future
13. threatened with extinction unless the circumstances that are threatening its survival

1. happens when a climax community or intermediate community is impacted by a disturbance
2. species that have a strong role in structuring a community
3. an organism that is not indigenous
4. when a species no longer exists in a particular area, but still exists elsewhere.
5. variety of life on Earth at all its levels, from genes to ecosystems
6. the species that first colonize new habitats created by disturbance
7. species and organisms that have become extinct
10. species which is likely to become endangered within the foreseeable future