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.
Cockroaches have many natural predators, including toads, frogs, beetles, geckos and iguanas. Some parasitic wasp species will target cockroaches as well. These species lay their eggs inside the egg cases of cockroaches; hatchlings feed upon nearby cockroach eggs.Entomopathogenic fungi have also been identified as lethal to roaches, as their spores attach to insects and kill them within weeks.ome parasitic wasp species will target cockroaches as well. These species lay their eggs inside the egg cases of cockroaches; hatchlings feed upon nearby cockroach eggs. Entomopathogenic fungi have also been identified as lethal to roaches, as their spores attach to insects and kill them within weeks.