Nitrogen is changed from a free gas to a usable form by a process called

nitrogen fixation.

nitrogen decomposition.

nitrogen compounding.

nitrogen circulation

nitrogen fixation.

Explanation:

Nitrogen fixation is the process by which the combination of molecular nitrogen oxygen or hydrogen is given to give oxides or ammonium that can be incorporated into the biosphere. Molecular nitrogen, which is the majority component of the atmosphere, is inert and not directly usable by most living beings.

this is true is that what u needed

answer; ///the correct answer to the above question is (