High blood pressure<span> (or </span>hypertension<span>) is the biggest risk factor for a stroke (by far).</span>
Answer:
Correlation virus causation.
Explanation:
The uncertainty of the direction by which these relationships exist indicate the importance of remembering the principle of correlation virus causation.
Answer: 5(last one :regulation of circulatory system)
I would have to say the answer is C.
A is incorrect since hydrogen is not an air pollutant.
B is incorrect because ozone is most definitely one of the top.
And D has cyanide which is a chemical for suicide during wars.
Hope this helps!
