The best title for the above diagram is "Terrestrial food chain". This is because the diagram shows the flow of energy from producers (plants) to primary consumers (herbivores), to secondary consumers (carnivores), and so on, within a land-based ecosystem. The arrows in the diagram indicate the direction of energy transfer, and the labels on each organism show their position in the food chain. The term "food web" typically refers to a more complex diagram that includes multiple interconnected food chains, whereas this diagram only shows a single, linear food chain.
