Heart disease is the leading cause of death in the U.S.
Heart disease is the leading cause of death for both men and women in the U.S. and also the leading cause of death worldwide. More than half of the deaths that occur as a result of heart disease are in men.
<span>Answer D is correct - gastroenteritis is not a possible consequence of exposure to ozone. In fact, ozone is used as an oxidant and disinfectant for surface and groundwater, and has been proved to destroy such diseases as the Norovirus.</span>
