Chapter 5 How Ecosystems Work

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Across
  1. 3. energy from the sun enters an ecosystem when a plant uses sunlight to make sugar molecules
  2. 8. an organism that makes its own food(autotrophs)
  3. 9. organisms that can fix atmospheric nitrogen into chemical compounds
  4. 10. process in which nitrogen is cycled between the atmosphere, bacteria, and other organisms
  5. 13. a final and stable community
  6. 14. organisms that get their energy by eating other organisms(heterotrophs)
  7. 15. process of breaking down food to yield energy
  8. 16. the type of succession that occurs on a surface where no ecosystem existed before
  9. 17. process by which carbon is cycled between the atmosphere, land, water and organisms
Down
  1. 1. a gradual process of change and replacement of some or all of the species in a community
  2. 2. movement of phosphorus from the environment to organisms and then back to the environment
  3. 4. a sequence in which energy is transferred from one organism to the next as each organism eats another
  4. 5. a diagram that shows the feeding relationships between organisms in an ecosystem
  5. 6. each step through which energy is transferred in a food chain
  6. 7. the more common type of succession, occurs on a surface when an ecosystem has previously existed
  7. 11. consumers get their food by breaking down dead organisms
  8. 12. the first organisms to colonize any newly available area and begin the process of ecological succession