Because they don't want to read or write about something that may not even be true, or it could just be an opinion.
<span>The correct answer is A. the results of a scientific study would be the most effective evidence. Thoughts and opinions are not valid for scientific studies because they are based on emotions and personal values. Ethics also have a problematic effect on science because values and morals are often different from society to society.</span>
A.Yes. It is never appropriate to use someone else's words as your own.