Answer :
Final answer:
The ultimate energy source in a food web is the sun, which is harnessed by producers like plants to sustain the flow of energy through different organisms.
Explanation:
Energy flow in ecosystems: In a food web, organisms acquire energy from the sun as the ultimate source. Producers like plants (e.g., grass) use sunlight for photosynthesis, creating their own food. Consumers (e.g., buffalo, lion) feed on these producers, with energy transferring through different trophic levels. Decomposers like bacteria and fungi break down dead organisms, returning nutrients to the ecosystem.
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