Answer :
Final answer:
A food chain demonstrates the flow of energy from one organism to another, starting from the primary producer to consumers, ending at the top predator. Sunlight is the ultimate source of energy in a food web.
Explanation:
A food chain is a linear sequence of organisms where each organism serves as a source of food for the next. In a four-part food chain example, energy moves from grass (autotroph) to grasshopper (primary consumer) to mouse (secondary consumer) to snake (tertiary consumer).
As energy moves through the food chain, it becomes less available and is eventually lost as heat, impacting the ecosystem's overall energy balance.
The ultimate source of energy for the food web is sunlight, which plants convert through photosynthesis into chemical energy.
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