Which of the following is an example of genetic engineering?
a. taking advantage of a naturally occurring mutation to produce a more cold-resistant salmon
b. inserting a gene from a flounder into salmon dna to produce antifreeze proteins
c. cross-breeding salmon and flounder to create a hybrid species
d. supporting an aquaculture fish farm with high-protein fish food

The answer to the question above is option B:  Inserting a gene from a flounder into salmon DNA to produce antifreeze proteins. When we say genetic engineering, this is the direct modification of a certain organism's genome with the use of biotechnology. Biotechnology is what is being used in order to make changes on the genetic makeup of the cells. One of the examples is the answer above which is the transfer of genes across or within species, such as the DNA of the flounder to the salmon. The result of this genetic engineering is an improved organism.