Why do some codons code for the same amino acid as another codon?
a. it is due to mutations.
b. there are only 20 amino acids and 64 possible combinations
c. each codon is unique and they all code for different amino acids.

B. There are only 20 amino acids and 64 possible combinations

Explanation:

A codon is the combination of three nitrogenous bases, which encode an amino acid. Some codons encode the same amino acid as another codon, this is because there are only 20 amino acids and 64 possible combinations.

Amino acids, in turn, are the organic substances that form proteins that will be responsible for various functions in our body, such as structural, enzymatic, defense, transport and hormonal functions.

bc blah

explanation:

bc blah

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.