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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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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