Final answer:
Food webs illustrate the complex network of energy flow in ecosystems, represent multiple intersecting food chains, and demonstrate how organisms like grasshoppers participate in various feeding relationships.
Step-by-step explanation:
Three statements that are supported by the food web represent its role in illustrating how energy and matter flow through an ecosystem, showcasing multiple feeding relationships between organisms, and demonstrating the complex network of energy transfer among various species. The food web provides a comprehensive picture of the ecosystem's structure and dynamics through its graphical representation of interconnected food chains. For instance, a single organism like the grasshopper can be part of different chains, as it feeds on plants but is also prey for spiders, birds, and other animals. Food webs show directional energy flow and help us understand the efficiency of energy transfer in ecosystems.