The characteristics of a strongly supported central idea in a nonfiction essay is that it ties together all other elements of the essay.
It should be noted that the central idea is the main idea that's illustrated by the author in a literary work.
It is the central, unifying element that can be found in the story.
The central idea in a nonfiction essay ties together all other elements of the essay. It helps in the creation of the dominant impression in the story.
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