Read the introduction from an argumentative essay about national parks.Most people who visit national parks are likely focused on the experience of visiting natural wonders. However, they may not realize how much time, money, and effort are necessary to maintain these parks. National parks must be preserved.

The introduction already gives background about the effort needed to maintain national parks and ends with the claim that they must be preserved. Adding supporting evidence, such as facts about the parks’ benefits or the effects of failing to maintain them, would make that claim more convincing. A topic sentence is not needed because the introduction already introduces its subject.

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