Rats that received unpredictable electric shocks in a laboratory experiment subsequently became apprehensive when returned to that same laboratory setting. this best illustrates that anxiety disorders may result from a. classical conditioning. b. stimulus generalization. c. observational learning. d. reinforcement.

The correct answer is option A. "classical conditioning".

Explanation:

Classical conditioning is a form of learning that involves the development of an association of an stimulus with a response, producing a behavior in an organism. The classic example performed by researcher Ivan Pavlov, is that a dog started to salivate after putting the tone he used previously in numerous occasions right before feeding him. Classical conditioning can also be the reason behind anxiety disorders. One example is illustrated in the question, when rats were exposed to unpredictable electric shocks in a certain laboratory. Something similar happens in dogs who are afraid of veterinarians because they associate them with receiving an injection.

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.