Which is not recycled in the ecosystem?
Correct answer: D. Energy
- A. Wind
- B. Carbon
- C. Oxygen
- D. Energy
Explanation
Energy flows through an ecosystem and is progressively lost as heat, so it must continually enter, mainly as sunlight, rather than being recycled. Carbon and oxygen participate in biogeochemical cycles, while wind is a moving form of energy and is not the best biological answer. Students may choose carbon because it is repeatedly transferred between organisms and the environment.
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