heart

Edit Answers
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Across
  1. 3. absent
  2. 5. common
  3. 7. hereditary
  4. 10. present
  5. 11. blood
  6. 12. individual
  7. 13. type
  8. 15. negative
  9. 17. rare
  10. 18. system
Down
  1. 1. vessel
  2. 2. antigens
  3. 3. antibodies
  4. 4. group
  5. 6. cardiovascular
  6. 8. positive
  7. 9. cells
  8. 13. trait
  9. 14. phenotype
  10. 16. transfusion