How do humans impact ecosystems?

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Across
  1. 4. Group that creates of a lot of trash.
  2. 5. An attempt to preserve or protect and environment from harmful changes.
  3. 6. Any substance that damages the environment.
  4. 7. Community of interacting organisms and their physical environment.
  5. 9. Place where trash is dumped and covered over.
  6. 10. Plant brought to the United States to use as food and medicine.
Down
  1. 1. Animals accidentally brought to the United States around 1998.
  2. 2. Puts limits on how many animals a person can hunt or fish.
  3. 3. A plant or animal species that does not grow naturally in an ecosystem.
  4. 8. These can interact and change their environments.