What type of mutation does not change the amino acids produced

Silent mutations are base substitutions that result in no change of the amino acid or amino acid functionality when the altered messenger RNA (mRNA) is translated. For example, if the codon AAA is altered to become AAG, the same amino acid  lysine  will be incorporated into the peptide chain.

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the answer is c.) there is a warm front in region a and a stationary front in region b.