Unit 4 Crossword

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Across
  1. 4. decline
  2. 5. environmental system
  3. 7. high risk of living
  4. 9. water cultivation
Down
  1. 1. top animal in the ocean
  2. 2. stable
  3. 3. vanish
  4. 6. vital
  5. 7. huge
  6. 8. who can make their own food