How is the text structured in this passage from the prologue? It has a chronological structure because it shows the evolution of different sweeteners over time. It has a cause-and-effect structure because it shows how a rock drawing led to the use of sweeteners. It has a compare-and-contrast structure because it describes similarities and differences between different sweeteners. It has a problem-and-solution structure because it shows how ancient people solved the dilemma of finding sweeteners.