North Africa, region of Africa comprising the modern countries of Morocco, Algeria, Tunisia, and Libya. North AfricaEncyclopÃ¦dia Britannica, Inc.The geographic entity North Africa has no single accepted definition.
A Stressor is anything (physical or psychological) that produces stress (negative or positive) is considered a stressor.
A resistor is an electrical component that limits or  regulates the flow of electrical current in an electronic circuit.  Resistors can also be used to provide a specific voltage  for an active device such as a transistor.