Ant is the Organic Item, because mother nature made him. :D
During exercise stroke volume increases because more blood is sent back to the heart due to the muscles squeezing blood in the veins
The chart very nicely lays out the amino acid each codon corresponds to. You're looking for "trp" in the chart, which only appears once, beside the UGG codon. Therefore, only one codon codes for tryptophan.