Marine Threats and Pests crossword

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Across
  1. 3. the presence of a substance that is harmful to the environment
  2. 5. to damage the health of
  3. 7. excessive fishing
  4. 8. the excavation of material from a water environment
  5. 12. making something impure or unsuitable by contact or mixture with something unclean, bad, etc.
  6. 13. a human activity that puts the health of the marine environment at risk
  7. 14. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding
Down
  1. 1. the surroundings or conditions in which a person, animal, or plant lives
  2. 2. causing great damage
  3. 4. relatinf to the sea
  4. 6. extend over a large area
  5. 7. any living system that functions as an individual entity
  6. 9. an invasive, non-native plants and animals that cause damage to the health of the native marine environment
  7. 10. not indigenous to a particular place
  8. 11. introduced species to an environment that becomes overpopulated and harms its new environment