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One of the great contributions the Sumerians made to civilization was their many inventions. They invented the first form of writing, a number system, the first wheeled vehicles, sun-dried bricks, and irrigation for farming. All of these things were important for the development of human civilization.
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I believe the answer is A or D
<span>II is the correct answer. Subheadings appear frequently within text; their function is to break up the text into relevant sections so that it is easier for the reader to digest and to provide information when people are scan reading.</span>
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I'm pretty sure u should use a tutor for this because this is way to long
