Cheese is made from curds. White glue is made from the casein of the curds. While promoted by a spokesbull and made by a milk company, Elmer's Glue-All is a synthetic resin glue that does not contain casein. Before scientists discovered how to synthesize plastics from petroleum products, plants and animal fats were used to make natural plastics, which eventually decompose. Biodegradable plastic is made by adding starch to the plastic.
Bacteria then feed on the buried plastic.
In surgery, stitches are now made using plastics that slowly dissolve in body fluids. Twelve or more cows are called a flink. There are more plastic flamingos in America than real ones. In 1975, a Holstein cow in Indiana produced 195.5 pounds of milk in one day. That's enough to provide a hundred people with nearly a quart of milk each.