Ferritin is an intracellular protein storing iron. It is found in hemoglobin that aids in metabolism function. Meanwhile, glycogen is a carbohydrate consist of glucose which can be hydrolyzed if needed. The answer then is that both ferritin and glycogen functions by storing the materials needed by an organism like humans.
A couple of the methods of molecular biotechnology are cloning and recombinant DNA.
I think it might be the first one: hiv infections. (hope this helps!)
Nature does = environmental stress or changes
