Which codon is the code for the amino acid valine (val)? apex?

A codon is a tree letter nucleotide sequence that represents amino acids. A single amino acid can have more than one codon. The valine codon can be one of the following: GTT, GTC, GTA, GTG. This is particularly useful during the translation of mRNA into protein. 

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

the form of energy changes and the total energy increases0l