Metabolism crossword

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Across
  1. 2. acid proteins
  2. 5. Membrane
  3. 6. explanation
  4. 7. atom
  5. 9. system bloodstream
  6. 10. system food
  7. 11. air
Down
  1. 1. proof
  2. 3. Lean beef
  3. 4. bread
  4. 6. system breathe
  5. 8. proposed answer
  6. 12. sugar