Communities

1. When one animal hunts and eats another animal
3. A species that has a very large impact on an ecosystem even if there are not many of them
14. One organism benefits and the other is not helped or harmed
15. Both organisms benefit from the relationship
18. How quickly an ecosystem can recover after a disturbance
19. The gradual change in an ecosystem over time
21. When one species outcompetes another and forces it out
22. A species that creates a habitat for other organisms
23. When organisms move into a new area and start living there

2. A species that may become extinct soon
4. When organisms compete for the same resource but never directly fight or interact
5. When a species no longer exists on Earth
6. One organism benefits while the other is harmed
7. An event that changes an ecosystem (fire, flood, storm, etc.)
8. A close relationship between two different species living together
9. When an ecosystem starts growing where there was no soil before
10. When one species helps another species survive
11. All the different species living in the same area
12. When species survive because they can handle the conditions better
13. The species that is most common or has the biggest effect on the ecosystem
16. When an ecosystem regrows where soil already exists
17. When one species prevents other species from growing
20. The number of different species in an area