I believe Diagram <span>is used to organize information within an informational text.
Diagram is often use to give a sumple summarization for a certain data, that allow the readers to understand it without having to dig deeper on the actual numbers of the data. Diagram technique is preditcted to became popular since the enlightment period.
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Parallel structure should be used when you connect clauses with a coordinating conjunction such as: for, and, nor, or, but, so, or yet. Some examples of this include: Correct: Every morning, we make our bed, eat breakfast and feed the dog. Incorrect: Every morning, we make our bed, eating breakfast and feed the dog.