Macronutrient (ecology)
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A macronutrient in ecology is an essential chemical element needed in large quantities by all living things in order to function normally. They include the nonmetallic "big six:" carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur. Occasionally, the macrominerals are included in the definition, but are usually excluded in scientific discussion.
The other macronutrients are the metals sodium, magnesium, potassium, calcium, manganese, iron, copper, zinc and molybdenum.