Challenge 4

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Across
  1. 2. – Planting trees to restore forests.
  2. 5. – Non-native species causing environmental harm.
  3. 8. – Large area covered with trees.
  4. 11. – Long winter sleep used to conserve energy.
Down
  1. 1. – Returning habitats to a healthy condition.
  2. 3. – Vast body of salt water.
  3. 4. – Seasonal movement of animals.
  4. 6. – Active mainly during the night.
  5. 7. – Group of similar living organisms that can reproduce.
  6. 9. – Where a river meets the sea.
  7. 10. – Natural flowing watercourse.