Discussion
Which of the following best represents the flow of energy through an ecosystem?
Answer: C
Energy flows Sun \(\rightarrow\) Producers \(\rightarrow\) Primary consumers \(\rightarrow\) Secondary consumers.
Energy enters an ecosystem as sunlight, is captured by producers (green plants and algae) in photosynthesis, passes to primary consumers (herbivores) that eat the producers, and then to secondary consumers (carnivores) that eat the herbivores. At each step much of it is lost as heat, so the flow is one-way.
The option without the Sun omits the source of the energy. Putting secondary consumers before primary consumers breaks the food chain, and the last option runs the flow backwards.
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