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Photosynthesis is important because it produces organic substances, like energy-rich carbohydrates, from simple inorganic ones such as carbon dioxide and water.

All organisms need organic compounds, but only those that perform photosynthesis (autotrophs, or producers) can produce their own. The rest of us (heterotrophs, which includes consumers, decomposers, and saprotrophs) rely on autotrophs for a supply of organic substances.

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