Nature of Ecosystems

4. a source normally unavailable to producers such as fossilized remains, rocks, and deep-sea sediments
6. feed on other organisms
8. exemplified by the carbon and nitrogen cycles
10. feed on dead organic material in soil
12. feed on plants and animals:example. Humans
14. producers take in inorganic nutrients from the environment
17. describes the continuous movement of nitrogen from atmosphere to the ground & sea
18. a community along with its physical and chemical environment.
19. complicated relationships that exist in natural ecosystems

1. feed on other animals
2. make their own food
3. when producers absorb solar energy
5. sedimentary cycle that consists of the movement of phosphorus from rocks to soil & sea
7. exemplified by the phosphorus cycle
9. through which chemicals move along food chains, perhaps never entering an exchange pool
11. a source from which organisms do normally take chemicals, such as the atmosphere
13. describes the continuous movement of water on and below the earths surface
15. both land and aquatic organisms exchange carbon dioxide with the atmosphere
16. feed on solely plants or algae