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Photosynthesis is the fundamental process by which plants, algae, and some bacteria convert light energy into chemical energy. Using , water, and dioxide, organisms create glucose, a sugar serves as food. process takes place cell structures called , which contain green chlorophyll. As a crucial byproduct, photosynthesis releases oxygen into the atmosphere, which is essential for most living things to breathe. It forms the foundation of nearly all food chains on our planet.