What are micronutrients and why do we need them?

Explanation:

Micronutrients are one of the major groups of nutrients your body needs. They include vitamins and minerals. Vitamins are necessary for energy production, immune function, blood clotting and other functions. Meanwhile, minerals play an important role in growth, bone health, fluid balance and several other processes.

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thinking it would be d not too sure but i think it's right

d. planting trees

the trees take in carbon to make oxygen.