8. Why is nitrogen used in fertilizer when there's so much N, in the air? O A. There's relatively little air underground.
O B. Ny is toxic to plants.
O C. It's a macronutrient, while gaseous N is a micronutrient.
O D. Plants can't use N2 from the air.

D. Plants can't use N2 from the air

Explanation:

Plants do not and cannot get their N2 directly from the air. Plants get their N2 through a cycle called Nitrogen Fixation.

This means plants need the nitrogen in the soil to consume it and get value from said nitrogen.

Hence, D. Plants can't use N2 from the air, is correct.

Hopes This Helps :)

lipid

explanation:

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?