Final answer:
According to the Cannon-Bard theory of emotion, fear is experienced simultaneously with physiological arousal when seeing a shark.
Step-by-step explanation:
The reason why you feel fear when seeing a shark is because you have experienced a specific pattern of physiological responses that your brain recognizes as fear.
According to the Cannon-Bard theory of emotion, physiological arousal and emotional experience occur simultaneously, yet independently. So, when you see the shark, you feel fear at the same time that your body mounts its fight or flight response.