Question

which of these is a macronutrient
(a) iron.
(b) boron.
(c) zinc.
(d) nitrogen.​

Answer 1

Answer:

Nitrogen, Potassium and Phosphorus.

All other options have only micronutrients and thus 'D' turns the correct answer.

The primary macronutrients: nitrogen (N), phosphorus (P), potassium (K) the three secondary macronutrients: calcium (Ca), sulfur (S), magnesium (Mg) the micronutrients/trace minerals: boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni).

In relatively large amounts, the soil supplies nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur; these are often called the macronutrients. In relatively small amounts, the soil supplies iron, manganese, boron, molybdenum, copper, zinc, chlorine, and cobalt, the so-called micronutrients. Nutrients must be available not only in sufficient amounts but also in appropriate ratios.

Explanation:

please mark me as a brianlist i really needed

Answer 2

Answer:

All of these are macronutrient.