In the context of molecular genetics, how does one reconcile the terms overlapping genes and nonoverlapping code

A sequence of DNA can encode different gene products (overlapping genes), whereas each specific nucleotide letter in this sequence can not be used by two different codons (i.e., genetic code is nonoverlapping)

Explanation:

The overlapping genes are nucleotide sequences transcribed in two (or more) different messenger RNAs (mRNAs), which are subsequently translated in two (or more) unrelated proteins. The overlapping genes are originated by an evolutionary process known as overprinting, where mutations in an Open Reading Frame (ORF) enables the emergence of a second ORF that encodes a new functionally unrelated protein. On the other hand, the codons in the nucleotide sequence do not overlap, i.e., one specific letter (nucleotide) is used only by one single codon. It is for that reason that the genetic code is nonoverlapping.

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.