Unit 3 Biology

1. Chemosynthesis supports food chains, pocket ecosystem.
5. Succession following a disturbance that destroys a community without destroying the soil
7. The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
8. collection of ecosystems with similar temperatures, rainfall totals, and climax/mature communities.
9. A species only found in that area.
14. a conscious decision to clear an area of forested land.
17. no light, no photosynthesis, depends on input from
19. No 2 organisms can occupy the same niche in the same environment.
20. A collection of all the food chains in an ecosystem

2. an aquatic region characterized by a particular combination of salinity, depth, and water flow
3. A pioneer species that is a plant/fungus symbiotic relationship. Breaks down rock to create soil.
4. Between low and high tide, organisms deal with waves and partial dry times.
6. the condition of being populated with excessively large numbers.
10. The long term heating of earth's surface.
11. measurement of the variety and richness of species in an ecosystem
12. An ecological succession that begins in an area where no biotic community previously existed
13. These communities often display regular/uniform distribution among producers.
15. A non-native species that is placed in a community.
16. First species to populate an area during primary succession
18. Where light penetrates, photosynthesis.