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.
American cockroaches are reddish-brown in color and are one of the longest domestic cockroach species, measuring approximately 40 mm in length. Pennsylvania wood roaches measure approximately 20 mm in length. Male adults of this species are tan in color. Difference Between a Cockroach and a Palmetto Bug.