Which of the following statements about the genetic code is true?
a. a codon can specify more than one amino acid.
b. every codon specifies a different amino acid.
c. some codons specify the same amino acid.
d. some codons have no function at all.

c. Some codons specify the same amino acid.

Explanation:

Codons are triplets of nucleotides in mRNA that is used for the protein synthesis (translation). A codon specifies a single amino acid, but there are exceptions. tRNA molecule contain anticodons, triplets of nucleotides that are complementary to codons. So, during the translation, tRNA carries the amino acid, that corresponds to  the codon in mRNA.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a