Across
- 1. - Trace element
- 3. - Enzyme metal
- 6. - Respiration gas
- 7. - Blood electrolyte
- 10. - DNA element
- 11. - Antioxidant element
- 13. - Bone mineral
Down
- 2. - Protein element
- 3. - Organic backbone element
- 4. - Intracellular ion
- 5. - Water forming element
- 8. - Thyroid element
- 9. - Enzyme cofactor
- 11. - Protein structure element
- 12. - Oxygen carrier metal