Puddings are thickened with starches such as corn starch or tapioca. Carbohydrates include sugars, starches, and fiber. Some cultivated plant varieties have pure amylopectin starch without amylose, known as "waxy starches". They are attracted particularly to meats, starches, sugars, and fatty foods. Quality biodegradable mulches are made out of plant starches and sugars or polyester fibers. Ethanol can be made from mineral oil or from sugars or starches. This makes it similar to resistant starches and other fermentable carbohydrates. Certain bacteria in the mouth live off the remains of foods, especially sugars and starches. Many microbes also produce amylase to degrade extracellular starches. They help the person digest fats, starches, and proteins. Silverfish consume matter that contains polysaccharides, such as starches and dextrin in adhesives. Carbon forms the backbone of most plant biomolecules, including proteins, starches and cellulose. Wheat and dura sorghum are the staple starches. Meals tend to favor meats and starches over dairy products and vegetables. Today, modified carboxymethylated cold soluble starches are mainly used.