Final answer:
Heat stroke is caused by an excessively high body temperature and the failure of the body's cooling mechanisms.
Step-by-step explanation:
A direct cause of heat stroke is when the body temperature becomes too high. Heat stroke occurs when the body's cooling mechanisms fail and the body is unable to regulate its temperature. This can happen when a person is exposed to high temperatures or engages in strenuous physical activity without proper hydration and rest.
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