Science · Biology - Vitamins
विटामिन B12 में कौन सा धातु आयन/खनिज घटक उपस्थित रहता है?
- 1मैग्नीशियम
- 2कोबाल्ट✓
- 3जस्ता (जिंक)
- 4लोहा (आयरन)
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