A central idea can be identified by looking at the key message or principle which is being buttressed or supported by other parts of the text or literature.
What is a Central Idea?
The central idea of a text, poem, article, song or book or any kind of literature for that matter refers to the key message in the literature or what it is mainly about.
The central idea is not the same thing as the topic of the text. In most cases, the Central idea can be stated in one sentence or phrase.
Please note that there is insufficient information about the essay hence the general answer.
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