Parasitism is a relationship in which one organism (the parasite) benefits while the other(the host) is harmed. This is a positive, negative relationship. (Campbell)( Dionne L Rice Jr) The parasite usually lives on or inside the other organism. For example, mosquito is a parasite, feeding on a human while transferring the disease called Malaria.
Artificial brush fibres are most commonly made of nylon and polyethylene, though vinyl and steel wire are also used for certain applications. Nylon fibres are either tapered and split like hog bristles for use in paintbrushes or left untapered for making cleaning brushes, hair brushes, and toothbrushes.
During WWII, Nylon was used as a substitute for silk in parachutes. The first commercial use of this revolutionary petroleum product was for toothbrushes. On February 24, 1938, the Weco Products Company of Chicago, Illinois, began selling its new âDr. Westâs Miracle-Tuftâ â the earliest toothbrush to use synthetic DuPont nylon bristles. Americans will soon brush their teeth with nylon â instead of hog bristles, declared an article in the New York Times.