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.
Unhygienic scavengers in human settlements. Cockroaches are among the most common pests in many homes and other. buildings. At night they search for food in kitchens, food storage places, rubbish. bins, drains and sewers. They are pests because of their ï¬lthy habits and bad smell. Some people may become allergic to cockroaches after frequent exposure. Cock-. roaches can sometimes play a role as carriers of intestinal diseases, such as. diarrhoea, dysentery, typhoid fever and cholera.