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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, serves their food . A vital byproduct of process is oxygen, which is into atmosphere and is essential for living things. This chemical reaction primarily occurs within the chloroplasts found in a plant's leaves. Ultimately, photosynthesis supports nearly all life on Earth by producing both food and breathable air.