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Carbon is a fundamental element of life and circulates continuously between the atmosphere, biosphere, hydrosphere, and lithosphere through a complex series of processes known as the carbon cycle. In terrestrial and aquatic ecosystems, plants play a central role by fixing atmospheric carbon dioxide during photosynthesis and converting it into organic compounds such as carbohydrates, proteins, and lipids. This fixed carbon becomes the primary source of energy ________ ______ ___ ________ ____ ___ ________ ___ _______ _____.
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