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.
Large Cockroaches. The most common large cockroaches include the American, the smokybrown, and the oriental. These cockroaches are normally found outdoors, but they can live inside. American cockroach adults range in size from 1Â½ to 2 inches.