There are 64 codons and 20 amino acids. which of the following is true.
a: several different codons can specify the same amino acid.
b: each codon specifies a different amino acid
c: some amino acids have no link to a codon
d: each amino acid is specified by only one codon

I did the small quiz and the right answer is Several different codons can specify the same amino acid.

Explanation:

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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d. changes in climate and historical records

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