Which best defines nitrogen fixation?

A.) the process of creating free nitrogen for plants to absorb
B.) the breakdown of nitrogen in the soil
C.) the conversion of nitrogen gas into a usable form
D.) the destruction of the bonds between nitrogen and other elements

A. The process of creating free nitrogen for plants to absorb.

Nitrogen fixation is the breakdown of nitrogen in the soil. Nitrogen fixation is the conversion of nitrogen gas into a usable form.
Nitrogen Fixation is the destruction of the bonds between nitrogen and other elements.

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.