natural resource puzzle

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Across
  1. 3. happens when a climax community or intermediate community is impacted by a disturbance
  2. 6. represents feeding relationships within a community
  3. 11. a mechanism of evolution
  4. 12. nonliving organisms in an ecosystem
  5. 15. a type of symbiotic relationship where all species benefit from their interactions
  6. 16. essential for the processes that support all life
  7. 18. living organisms of an ecosystem
Down
  1. 1. a community of interacting organisms
  2. 2. used to identify different organisms, based the organism's observable traits
  3. 4. the study of the relationships between living organisms
  4. 5. happens when a new patch of land is created or exposed for the first time
  5. 7. an organism that feeds on other organisms
  6. 8. Association between two different organisms wherein one benefits at the expense of the other
  7. 9. a diverse group of organisms that interact with each other in a common location
  8. 10. a group of individuals of the same species living and interbreeding within a given area
  9. 13. a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter
  10. 14. an organism that creates its own food or energy
  11. 17. regions of the hydroshere and atmosphere occupied by organisms