Biology- Unit 9

2. species that are native to and found only within a limited area
9. too many people in one place for the resources available
12. A gradual increase in average global temperature
13. the variety of life in the world or in a particular habitat or ecosystem.
14. An organism made of a fungus and either algae or autotrophic bacteria that live together in a mutualistic relationship.
17. a biome of or pertaining to land, as in terrestrial ecosystem
18. Succession following a disturbance that destroys a community without destroying the soil
19. First species to populate an area during primary succession
20. Portion of the marine biome that is shallow enough for sunlight to penetrate.

1. A species that influences the survival of many other species in an ecosystem
3. a stable community that no longer goes through major ecological changes
4. growing or living in water
5. succession that occurs on surfaces where no soil exists
6. permanently dark layer of the oceans below the photic zone
7. the tidal mouth of a large river, where the tide meets the stream.
8. Release of harmful materials into the environment
10. plants and animals that have migrated to places where they are not native
11. a system of interlocking and interdependent food chains.
15. Destruction of forests
16. A group of ecosystems that share similar climates and typical organisms