Answer:
examples and descriptions
Explanation:
Hello
d)all of these are needed items
All of these are important you need to author's name to quote them, you need the title so readers know what you are researching, and dates of publication, so they know around the time this was published.
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The main purpose of subheadings are: They stand out because of their size and attract attention. The scanner will stop to read them and continue scanning until the next subhead which they'll then read. Scanning from subhead to subhead, they serve to guide the reader down the page.
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Hope it helps...</h2>
