biology unit 9

2. symbiotic association between a fungus and a photosynthetic organism
3. A species that influences the survival of many other species in an ecosystem
5. plants and animals that have migrated to places where they are not native
7. spots on the ocean floor where hot gases and minerals escape from earth's interior into the water
11. oceans, estuaries, lakes, and ponds
12. A group of ecosystems that share similar climates and typical organisms
14. Portion of the marine biome that is shallow enough for sunlight to penetrate.
17. First species to populate an area during primary succession
19. An ecological succession that begins in an area where no biotic community previously existed
20. Succession following a disturbance that destroys a community without destroying the soil

1. Destruction of forests
4. species that are native to and found only within a limited area
6. community of organisms where there are several interrelated food chains
8. An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
9. permanently dark layer of the oceans below the photic zone
10. biome Biomes on land (forests, taiga, tundra, etc.)
13. the variety of life in the world or in a particular habitat or ecosystem.
15. A stable, mature community that undergoes little or no change in species over time
16. The number of people in an area exceeds the capacity of the environment to support life at a decent standard of living.
18. A habitat in which the fresh water of a river meets the salt water of the ocean.