Amino acid is related to a protein like A)a sugar is to fat.
B)fat is to a lipid
C)a nucleotide is to DNA.
D)DNA is to RNA

option C is correct

Explanation:

amino acid are the building blocks of protein similarly nucleotide are the building blocks of DNA and RNA

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.