Affect is a psychological term for an observable expression of emotion. A person's affect is the expression of emotion or feelings displayed to others through facial expressions, hand gestures, voice tone, and other emotional signs such as laughter or tears. Individual affect fluctuates according to emotional state.
There are over 3,000 different species of cockroaches-some are considered pests while others are beneficial in their natural environment. The three main types of cockroaches commonly found in homes in South Africa include the German cockroach, Oriental cockroach and American cockroach.
German Cockroaches. The German Cockroach is the most common of all roaches found in America. The German roach is most likely to infest your home. Unlike the American Roach, the German variety prefers to nest indoors. They cannot survive outside for prolonged periods. They are hitchhikers and are often introduced into homes in luggage, used clothing and second-hand furniture.