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.
Invention of the Electric Toothbrush. Throwback Thursday is taking it back to 1939 when the Swiss inventor, Dr. Philippe Woog, invented the first oscillating electric toothbrush. Itâs worth noting that in the 1880âs, Dr. Scott claimed to have invented the first electric toothbrush.