Final answer:
Counterclaims and evidence are essential for supporting opposing arguments and strengthening the main claim in an essay.
Explanation:
Counterclaims are used to support an opposing argument by presenting viewpoints that contradict the main claim. In an argumentative essay, addressing counterclaims shows fairness and credibility. Evidence such as quotations, statistics, and expert testimony is crucial in refuting counterarguments and strengthening the main claim.
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