Final answer:
Researching to find evidence is crucial in writing an argumentative essay.
Step-by-step explanation:
When writing an argumentative essay, the most important reason to conduct research is to find evidence to support the arguments. Research allows you to gather facts, statistics, examples, and expert opinions that can back up your claims and make your essay more persuasive and credible. By presenting strong evidence, you can effectively convince your readers to adopt your point of view on the topic.
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