which structure of a protein is the second folding of the protein chain?

primary

secondary

tertiary

quaternary

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.