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Classical Conditioning was used by Ivan Pavlov to show how a signal can stimulate a response such as a bell. Here the dog associates the sound of a bell to food.
Operant Conditioning, on the other hand, was used by B.F Skinner. It associated reinforcement and punishment with a certain desired behavior. For example, a dog eagerly gets the ball because it gets something in return. Punishment can be a ground for not having something that a person wants, so the person avoids breaking the rules.
Several ways : make time for the things you enjoy, learn how to relax, figure out what's causing the stress and work towards a positive solution, exercise is a great way to stimulate those good endorphin's, and try to socialize with people you LIKE being around.
D.increase the amount of essential fat
