Which of the following is NOT a macronutrient for plants?

Which of the following is NOT a macronutrient for plants?

Step 1: Understand what macronutrients are. Macronutrients are nutrients that plants need in large amounts to grow.
Step 2: Identify the common macronutrients for plants. The main macronutrients are nitrogen, phosphorus, and potassium.
Step 3: Learn about micronutrients. Micronutrients are nutrients that plants need in smaller amounts.
Step 4: Identify iron as a micronutrient. Iron is important for plants but is needed in smaller quantities compared to macronutrients.
Step 5: Conclude that since iron is a micronutrient, it is NOT a macronutrient for plants.

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