| 21. | Radioactive isotopes can continue to release energy over periods ranging from weeks to decades.
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| 22. | Plants use these organic compounds to build structural components or respire them to release energy.
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| 23. | To operate they constantly take in and release energy.
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| 24. | Fusion relies on the merging of nature's lightest elements to release energy, including radioactive byproducts.
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| 25. | They undergo electrochemical reactions to store or release energy.
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| 26. | If breaking bonds released energy, they would break spontaneously and molecules would not be stable.
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| 27. | In the atmosphere it condenses again, releasing energy that fuels updrafts, and thereby forms clouds.
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| 28. | Burning iron does not release energy; it absorbs energy.
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| 29. | The positrons will almost instantly annihilate with electrons, releasing energy in the form of gamma rays.
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| 30. | Like us, many bacteria must respire _ combine food with some other substance to release energy.
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