crossword puzzle

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Across
  1. 4. all the living & non-living parts of an environment
  2. 6. all organisms living in a certain area
  3. 7. organism that makes its own food
  4. 9. thin zone of the earth that supports all life
  5. 10. all members of one species that live in the same area
  6. 12. place where an organism lives
  7. 13. not dead
Down
  1. 1. study of the relationship between living things and their environment
  2. 2. organism that gets food by eating other organisms
  3. 3. model of the flow of energy through an ecosystem
  4. 5. organism that feeds on dead organisms
  5. 8. combining and overlapping of many food chains
  6. 11. an organism's role in it's environment