environmental interactions

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Across
  1. 1. make their own food
  2. 4. place where an organism lives and interacts
  3. 5. puts nutrients in to the soil
  4. 7. succession gradual changes to an environment
  5. 8. essential to the survival of other living things
  6. 11. populations living in one place
Down
  1. 1. all living individuals of a species in an area
  2. 2. what a species needs to stay alive such as air, water
  3. 3. the saving of the earth's resources
  4. 6. dangerous levels of substances that harm the environment
  5. 7. energy flows through this in one direction
  6. 9. must go out and find its food
  7. 10. pollution causes the depletion of this layer