read the passage:\na bridge made of grass\nlong before engineers used steel beams to create bridges, in what…

read the passage:\na bridge made of grass\nlong before engineers used steel beams to create bridges, in what is now south america, the inca people used a very different material to make bridges. they used grass. these types of bridges are not commonly made anymore. however, every year there is a three - day festival where people from different villages come together and recreate an inca bridge.\nropes\nthe inca picked long strands of grass. they braided these strands together to make big, strong ropes. three grass ropes were woven together to make very tough ropes that were as thick as a human body and as long as the canyon crossing.\nfloor\nthe bridge floor was made of grass ropes that were tied together to look like a cable. across the cable floor they laid planks of wood. finally, they covered the floor with branches to help create a firm floor for animals and people to cross.\nwhat is the purpose of the subheadings in the passage?\n1. to highlight the main features of the bridges\n2. to give examples of many different types of bridges\n3. to compare the natural materials used in the bridges\n4. to explain the different places the incas built bridges
Answer
Brief Explanations:
The sub - headings "Ropes" and "Floor" focus on key parts of the Inca bridges, highlighting their main features. They don't give examples of different bridge types, compare natural materials in general, or explain bridge - building locations.
Answer:
- to highlight the main features of the bridges