Headaches are most often caused by? Head Injuries
Other illnesses
Emotional Upset Destress
Eye Problems

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Answerinaccuracy;

The american and russian labs that have the last of the live virus are run by fallible, corruptible  human  beings, who are given orders by governments staffed by fallible, corruptible  humanbeings. bio-war using  smallpox  isn't out of the question for either country's military establishment.

The heart and skull.if this was the appropriate answer make sure to mark as the brainliest! -procklown