Understanding thePassage
The higher the level of certain vitamins and minerals in the bloodstream, the better a person’s lung function, as measured by the amount of air the person can expel in onesecond.
↑ level of certain vitamins and minerals, ↑ lung function
How did we measure lung function?
By the amount of air expelled by the person in one second.
(I expect that the more air a person expels, the better we call his lung function. I notice that we are given a correlation in this
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