Explanation:

An outcome measured to see the effectiveness of the treatment.

The variable that is changed or manipulated in a series of experiments.
Hope it helps!
"Has" would make more sense. A tip would be to read the sentence with both words, one word at a time obviously (So Everyone HAS already voted in the election.) and just go with your gut on which one makes more sense, you can do it!
The two passages are different as the essay reveals <u><em>Pat Mora’s perspective,</em></u> while the article has a <u><em>less personal tone</em></u>.
From the complete question, it should be noted that in the essay, Pat More utilized the first-person point of view and this implies that the perspective of Pat was revealed in this case.
On the other hand, the article was written in the second-person and this shows that the time is less personal than that of the essay.
Therefore, the essay reveals Pat Mora’s perspective, while the article has a less personal tone.
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