Final answer:
The arrows from the grass to the fox in a food web represent the one-way flow of energy through the ecosystem.
Step-by-step explanation:
In a food web, the chains of arrows from the grass to the fox represent the one-way flow of energy through the ecosystem. Food chains and food webs show the feeding relationships between organisms and how energy is transferred from one organism to another. In this case, the grass is being eaten by the grasshopper, which is then preyed upon by the bird, snake, and owl. The energy from the grass is passed along the chain of arrows, from one organism to the next.