I believe that the answer to the question provided above is that the discretionary allowance in the usda food guide covers <span>D. all of the above</span>
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Answer:
20.9 percent
Around 78% of the air is nitrogen gas, and only 20.9% is oxygen.
Explanation:
20.9 percent
Around 78% of the air is nitrogen gas, and only 20.9% is oxygen.
Hope this helps.
I'm pretty sure that the answer is C.
