Read this excerpt from a book about machines. This book is divided into six parts. Each has information about one of the six types of machines: the wheel and axle (it changed civilization!); the inclined plane (those ramps!); the wedge; the lever; the pulley; and the screw (yes, it’s a simple machine). Each part includes some simple examples along with some of the complex structures that I have designed using one or more of these simple machines.

What text feature might include this passage?

references
introduction
acknowledgements
advantages and disadvantages

An introduction differs from a preface and a foreword because it's written by the author and does talk about the subject matter. A book introduction can include everything that would be in a preface: how the book came about, the scope of the book, why the book was written etc.

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the correct answer is option d. the nature of democracy. on november 19, 1863, president abraham lincoln delivered his famous gettysburg address in gettysburg, pennsylvania. in his speech, rather than focusing on details of the war (soldiers, casualties, aftermath of battle), lincoln invoked the very nature of democracy, that power ultimately comes from the people, when stating, “government of the people, by the people, for the people shall not perish”. these words mean that democracy is a government by the people (citizens) in which the supreme power is vested in the people and exercised directly by the people or by their elected representatives for the benefit of all citizens. the survival of democracy in the united states is one of the reasons why this speech so significant today.