If precise quantitative measurements are made on a convened ecosystem in a laboratory, we will find amounts of which of the following to be a one-way flow rather than cyclic?
Correct answer: A. Free energy
- A. Free energy
- B. Potassium
- C. Nitrogen
- D. Carbon
Explanation
Free energy enters ecosystems mainly as sunlight and is degraded as heat during transfers, so it flows in one direction. Elements such as carbon, nitrogen and potassium cycle between organisms and the environment.
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