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.
This invention forever changed the history of the toothbrush, as well as every other device that required a fibrous material, including ropes. In 1938, Nylon became the sign of modernization, from the creation of nylon stockings to Dr. West's first nylon toothbrush.This brush was called Dr. West's Miracle Toothbrush.he Chinese version of the toothbrush spread to Europe, where the Siberian wild boar took the brunt of the growing popularity of the invention. The only downside to the hairs of the Siberian wild boar was the fact that it was very rough on the gums.