Where r the options .... s z z x x x x x x x x x x x. X
Because the more someone exerts themselves the more oxygen and carbon dioxide out put ratio is greater. The more you run and the faster you run the more oxygen you loose which is supplied to your muscles including your lungs.
Answer:
i would go with marijuana
Explanation:
I think the answer is a because i read that studies show people who exercise are in the right mind set and often do better in life.