Question

Nitrogen fixation is______

the process of changing oxygen into a usable form of nitrogen
the process of changing free nitrogen into a usable form
the process of changing fossil fuels into a usable form of nitrogen.
the process of changing fixed nitrogen into a usable form

Answer 1

the process of changing free nitrogen into a usable form (the second option)

Step-by-step explanation:

Answer 2

the process of changing free nitrogen into a usable form (the second option listed)

Step-by-step explanation:

this is the answer by definition