Chapter 4 Vocabulary Review

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Across
  1. 5. Some bacteria obtain energy by converting nitrates into nitrogen gas, which is released into the atmosphere
  2. 9. Any nutrient whose supply limits productivity
  3. 11. or small pieces of dead and decaying plant and animal
  4. 12. Each step in a food chain or food web is called a
  5. 14. the first producers of energy-rich compounds
  6. 16. Total amount of living tissue within a given trophic level
  7. 18. harness solar energy to build living tissues through
Down
  1. 1. are powered by the flow of energy
  2. 2. There, primary producers are usually tiny floating algae
  3. 3. are elements that an organism needs to sustain life
  4. 4. are organisms that rely on other organisms for energy and nutrients
  5. 6. are models that show the relative amount of energy or matter contained within each trophic level in a food chain or food web.
  6. 7. Ecologists call this network of feeding interactions, through which both energy and matter move
  7. 8. only certain types of bacteria can convert nitrogen gas into ammonia
  8. 10. harness chemical energy from inorganic molecules
  9. 13. must acquire energy from other organisms
  10. 15. No living thing can create energy except...
  11. 17. series of organisms in which energy is transferred from one organ-ism to another