Section 1 & 2 Vocabulary

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Across
  1. 7. An organism that breaks down wastes and dead organisms
  2. 8. organism that obtains energy by eating only plants
  3. 9. level each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy.
  4. 11. cycle The continuous process by which water moves from Earth's surface to the atmosphere and back
  5. 12. cycle The transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere
  6. 14. web network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem
  7. 15. fixation process of converting nitrogen gas into nitrogen compounds that plants can absorb and use
  8. 17. fixers organisms that change nitrogen into a form of fertilizer that plants can use
Down
  1. 1. chain A series of steps in which organisms transfer energy by eating and being eaten
  2. 2. cycle Continuous flow of nutrients into and out of stores in the ecosystem; balanced, unless disturbed by human activity
  3. 3. An organism that can make its own food.
  4. 4. An organism that obtains energy by feeding on other organisms
  5. 5. An animal that eats both plants and animals
  6. 6. a plant, fungus, or microorganism that lives on dead or decaying organic matter.
  7. 10. A consumer that eats only animals.
  8. 13. bacteria Bacteria that change dissolved ammonia into nitrite compounds or nitrites into nitrate compounds.
  9. 16. cycle The organic circulation of carbon from the atmosphere into organisms and back again