Answer:
to grow the maize plant take nitrate ion (it is essential for the growth of the plant [maize] to grow it takes the nitrate ion basically nitrogen from the soil)
Organ System, Organ coll, tissue
A. Your leg jumping when it is hit by a reflex hammer
B, element
a molecule would require more than one atom. if one atom is left and is still gold, it would not be a molecule/mixture/compound.