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Match List-I with List-II and select the correct answer:
Match List-I with List-II and select the correct answer:
| List-I | List-II |
| a. Nitrogen | 1. Structural element |
| b. Iron | 2. Biocatalytical element |
| c. Molybdenum | 3. Indispensable element |
| d. Iodine | 4. Stimulating element |
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