Dark Stool: If your stool is black or bright red in color, it can mean that you are bleeding internally, as a possible result of an ulcer or cancer, and warrants a call to your doctor even if you think it could be hemorrhoids, or tiny tears in the anal tissue, due to constipation and straining.
The chemical reaction in which high molecular mass molecules are formed from monomers is known as polymerization. There are two basic types of polymerization, chain-reaction (or addition) and step-reaction (or condensation) polymerization.
The term polymer is derived from the Greek poly, meaning many, and mer, meaning parts  thus polymers are substances made of many parts. In most cases the parts are small molecules which react together hundreds, or thousands, or millions of times. molecule used in producing a polymer is a monomer  mono is Greek for single, thus a monomer is a single part. A polymer made entirely from molecules of one monomer is referred to as a homopolymer. Chains that contain two or more different repeating monomers are copolymers.