A better education system might be able to stop teen pregnancies. The governing notion is "better education," and the topic is "adolescent pregnancy may be prevented."
The composition is guided by the controlling notion. It clarifies expectations for the reader and provides the entire work a clear direction.
The sentences in a paragraph are related to the topic sentences in the same way as the paragraphs in a composition are related to the central concept.
Teen pregnancies might be prevented by a stronger educational system. Better education is the guiding principle, and the subject is "adolescent pregnancy may be averted."
Thus, this can be the one example of controlling idea.
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