Preservation of ecosystems

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Across
  1. 4. non governmental organization
  2. 5. involving questions of right and wrong
  3. 7. maintain (something) in its original or existing state
  4. 9. a living thing
  5. 11. the surroundings or conditions in which a person, animal, or plant lives or operates
  6. 12. the natural home or environment of an animal, plant, or other organism.
  7. 13. a biological community of interacting organisms and their physical environment
Down
  1. 1. prevention of wasteful use of a resource
  2. 2. is the introduction of harmful materials into the environment.
  3. 3. the variety of plant and animal life in the world or in a particular habitat, a high level of which is usually considered to be important and desirable.
  4. 6. a large area covered chiefly with trees and undergrowth
  5. 8. A example of an NGO that helps preserve the environment
  6. 10. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.