ecosystems

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Across
  1. 3. the study
  2. 4. what's this unit about
  3. 8. where something lives
  4. 9. the limit of a ____ in a place
  5. 11. the system of ____
  6. 12. basic
  7. 15. lots of ____ together
  8. 17. what we learned
Down
  1. 1. factor some alive
  2. 2. lots of ____ living together, all are alive
  3. 5. lots of ___ together
  4. 6. something that never lived
  5. 7. a type of one thing
  6. 10. how dense ___ is
  7. 13. there's six of them
  8. 14. even more basic
  9. 16. guess