According to the Arousal Theory of Motivation, it is said that each person has a specific level of arousal which is where they perform their best. We can assume that Mary's perfect level of arousal was before her car broke down. The run caused her to increase her level of arousal and the stress of the test will most likely increase this level even further. This being the case we can say that she will most likely perform badly on the exam.
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It was possible because it helped him navigate in territories that were completely unknown to him. Thanks to it, he could determine where his ship was based on the position of the sun and the time of the day and he used this to navigate all the way to India.
