Which criteria allow biologists to divide chemicals into macronutrients and micronutrients?

Question

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Biologists differentiate chemicals into macronutrients and micronutrients based on the amounts in which plants require them. Macronutrients are required by plants in large amounts, while micronutrients are needed in smaller amounts. The other criteria mentioned (essentiality for plant growth, availability in the soil, and how they are used by plants) can be used to further categorize these nutrients, but they are not the primary criteria used to differentiate between macronutrients and micronutrients.

Which Criteria Allow Biologists to Divide Chemicals into Macronutrients and Micronutrients