Diazotrophs, enzyme ,nitrogenase, catalyzes the addition of hydrogens to nitrogen

Nitrogen fixation is carried out by the enzyme nitrogenase, which are found in microbes. Microorganisms that fix nitrogen are bacteria called diazotrophs.  The removal of oxygen or the addition of hydrogen.

Hope this helps! :)

depends where

on my head

yes

on my legs

yes

on my

arms

yesh

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."