The document discusses cellular energy and metabolism. It explains that energy cannot be created or destroyed, but can be converted from one form to another. Metabolism involves catabolic and anabolic pathways. Catabolic pathways break down molecules to release energy, while anabolic pathways use this energy to build larger molecules. Photosynthesis is an anabolic pathway that converts light energy to chemical energy in glucose. Cellular respiration is a catabolic pathway that breaks down glucose to release energy in the form of ATP.
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