12.B

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Across
  1. 5. meaty areas system
  2. 6. bones system
  3. 8. lungs system
  4. 9. skin system
Down
  1. 1. brain system
  2. 2. blood system
  3. 3. ___ body system
  4. 4. How many systems
  5. 7. eggs and sperm system