Which of these best describes how text elements affect this passage? a) extensive white space in the document distracts the reader. b) heading-captions give a preview of the content that follows. c) varying print styles draw attention to specific information. d) chapter headings concisely summarize the main points the passage.

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.