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Photosynthesis is the fundamental process by which plants, algae, and some bacteria convert light energy into chemical energy. Using sunlight, water, carbon dioxide, organisms glucose, a sugar fuels metabolic activities. a vital byproduct of this process, oxygen is into the atmosphere, which living need to . This natural mechanism forms the foundation of nearly all food chains on the planet. Without photosynthesis, life as we know it would not be able to exist.