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The document discusses the path of energy from the sun to plants to humans. It explains that the sun's energy comes from nuclear fusion and travels to Earth where plants use photosynthesis to convert sunlight, carbon dioxide, water and nutrients into sugar, a form of chemical energy. Humans then obtain energy by eating plants or other organisms and can convert the chemical energy from food into other forms like heat or kinetic energy, which is eventually lost as heat during exercise or other activities.






