How do text features elaborate on key ideas?

Text features also help readers determine what is important to the text and to them. Without a table of contents or an index, readers can spend wasted time flipping through the book to find the information they need. Special print helps draw the attention of the reader to important or key words and phrases.

Explanation:

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uncanny would be like unlucky or disaster. you can look for more in the dictionary or if you have text book then turn to a. 17 but it's different with textbooks.