Which of the following is not a micronutrient? (A) B (B) \( \mathrm{Zn} \) (C) \( \mathrm{Mn} \)...

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Which of the following is not a micronutrient?
(A) B
(B) \( \mathrm{Zn} \)
(C) \( \mathrm{Mn} \)
(D) \( \mathrm{Mg} \)
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