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Given a scientific passage and an answer, generate a question for the given answer.

Passage: Physics also tells us that, although energy can be captured or transformed, it inevitably degrades, becoming heat, a less useful form of energy. This is why organisms require a constant input of energy; the work they must do uses up the energy they take in. Energy, unlike materials, cannot be recycled. The story of life is a story of energy flow its capture, transformation, use for work, and loss as heat. Answer: heat
Output:
When energy is captured or transformed, it inevitably degrades and becomes what less useful form of energy?