What amino acids are non degenerate?

A position of a codon is said to be a non-degenerate site if any mutation at this position results in amino acid substitution. ... There are three amino acids encoded by six different codons: serine, leucine, and arginine. Only two amino acids are specified by a single codon each.

Explanation:I'm kinda confused about your questions, I think this is what your asking for. Hope this helps, if not. I'll try redoing it! :))

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide