Before humans developed written language, they created pictures on rocks. This "rock art" often portrays animals or abstract designs. The pictures could have been records of events, plans, or messages. There are two basic types: pictographs and petroglyphs. Pictographs were drawn or painted on the surface of rocks with pigments such as charcoal, blood, or chalk. Petroglyphs, on the other hand, were scratched or carved into the rock itself. With some petroglyphs, only the surface layer of rock is removed, showing a lighter color of rock beneath the outer layer. Other petroglyphs consist of carvings cut deep in the rock. Most pictographs have faded, while petroglyphs have endured longer.

Question

Before humans developed written language, they created pictures on rocks. This "rock art" often portrays animals or abstract designs. The pictures could have been records of events, plans, or messages. There are two basic types: pictographs and petroglyphs. Pictographs were drawn or painted on the surface of rocks with pigments such as charcoal, blood, or chalk. Petroglyphs, on the other hand, were scratched or carved into the rock itself. With some petroglyphs, only the surface layer of rock is removed, showing a lighter color of rock beneath the outer layer. Other petroglyphs consist of carvings cut deep in the rock. Most pictographs have faded, while petroglyphs have endured longer.
Which organizational structure does this text primarily use?

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key idea
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3
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28
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GPT-4o mini · Answer

The organizational structure used in the text primarily follows a **compare and contrast** format. It introduces two types of rock art—pictographs and petroglyphs—and discusses their differences in terms of materials used, methods of creation, and durability over time. The text provides key information about each type, highlighting their unique characteristics while also suggesting a relationship between them as forms of expression prior to written language.