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In an ecosystem, which one shows one-way passage

1. free energy
2. carbon
3. nitrogen
4. potassium

Correct answer: free energy

Solution

Free energy moves through an ecosystem in a single direction: it enters mainly as sunlight, is transferred between trophic levels, and is ultimately dissipated as heat. In contrast, carbon, nitrogen, and potassium are recycled through biogeochemical cycles.

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