Read the passage. Pizza may have its roots in Italy, but the United States has certainly left its mark on the food. Pizza from the US is some of the most popular in the world. New York and Chicago are both known for their great pizza. Pizza is similar in both cities in that they include tomato sauce and mozzarella cheese. However, their crusts are very different. New York pizza has a thin, hand-tossed crust, while Chicago’s pizza is a thick, deep-dish crust that is cooked in a pan. Which text structure is used in this passage?