In a food web, arrows indicate what?

• A. Who eats whom
• B. The flow of energy
• C. The number of organisms
• D. The flow of matter

Answer: (B)

Arrows in a food web show energy moving through the ecosystem. They point from the organism that is eaten to the organism that eats it, illustrating how energy is transferred from producers up through herbivores to predators. They don’t depict how many individuals there are, nor the flow of matter cycling in the environment—the arrows specifically track energy flow and why energy becomes scarcer at higher trophic levels.