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Write your name, the date, and show your sources so people know you didnt steal anything either.
Gregory Stock is considered to be an expert in biotechnology. He has spent much of his career working to develop therapies for various conditions. He would be most qualified to write about new technologies in medicine.
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There are three main categories of evidence that are essential to gain the audience's confidence in the writer's assertions. These categories are Fact, Judgment, and Testimony. This page explores the types of evidence used in argumentation. See also the page on logic and argumentation.