Fear is a bad feelings caused by a recognized risk that causes creatures to take appropriate steps swiftly away from the location of the recognized risk, and sometimes cover up. It is a primary success procedure occurring in respond to a particular incitement, such as pain or the risk of risk. In short, fear is the ability to identify risk resulting in an encourage to deal with it or evade from it (also known as the fight-or-flight response) but in extraordinary instances of fear (horror and terror) a lock up or paralysis response is possible. Some specialists such as Bob B. Watson, Bob Plutchik, and Bob Ekman have recommended that there is only a small set of primary or natural feelings and that fear is one of them. This hypothesized set contains such feelings as joy, unhappiness, and rage. Worry should be recognized from the feelings stress, which generally happens without any certain or immediate exterior risk. Additionally, fear is frequently related to the particular habits of evade and prevention, whereas stress is the result of risks which are recognized to be unmanageable or expected. It is important to note that fear almost always corresponds to upcoming activities, such as deteriorating of a scenario, or extension of a scenario that is undesirable. Worry can also be an immediate respond to something currently occurring. All people have an instinctual respond to potential risk.