How do counterarguments make persuasive pieces stronger?

A counterargument is simply an argument that counters or goes against. You will be a stronger advocate for your position if you address the opposition. If your opponent offers an argument, and you propose a solution or another argument, then you are in a sense countering your opponent's argument.

Explanation:

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compare & contrast informative essay/speech

when speaking or writing for the sole purpose of providing information in order to give audience members a good basis for making a decision, you would present an informative speech or essay.   because you wouldn’t want to be persuading the audience by arguing for one type of exercise over the other, you wouldn’t choose a persuasive/argumentative technique.   to fairly, and without bias, present information about the pros and cons of each type exercise, a compare/contrast, informative speech/essay would be the best bet.

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