Nitrogen fixation refers to? 22:41 Microorganisms Nitrogen fixation refers to? A)The creation of organic molecules that contain nitrogen B)The conversion of ammonium (NH4) to N2 C)The conversion of N2 to ammonium (NH4) D)Radioactive decay of C-14 to N-14 Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+