Biology

2. A group of ecosystems that share similar climates and typical organisms
3. An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
5. relating to water
7. symbiotic association between a fungus and a photosynthetic organism
11. The number of people in an area exceeds the capacity of the environment to support life at a decent standard of living.
13. Portion of the marine biome that is shallow enough for sunlight to penetrate.
16. A species that influences the survival of many other species in an ecosystem
18. An ecological succession that begins in an area where no biotic community previously existed
19. permanently dark layer of the oceans below the photic zone
20. Ecological rule that states that no two species can occupy the same exact niche in the same habitat at the same time

1. Destruction of forests
4. Release of harmful materials into the environment
6. plants and animals that have migrated to places where they are not native
8. spots on the ocean floor where hot gases and minerals escape from earth's interior into the water
9. the variety of life in the world or in a particular habitat or ecosystem.
10. First species to populate an area during primary succession
12. species that are native to and found only within a limited area
14. A habitat in which the fresh water of a river meets the salt water of the ocean.
15. A stable, mature community that undergoes little or no change in species over time
17. A community of organisms where there are several interrelated food chains