No.
if the sentence was the other way around, you would need a comma. ie: Because she studied really hard, Shauna got an A in her chemistry test.
These words suggest that something is not perfect. It's to make something dim or less noticible. This is of course using my own words. The dictionary might say something else about these words.
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Answer:
He clearly can be described as a rhetorical public speaker who uses ethos in every part of persuading.
