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Photosynthesis is the fundamental process by which plants, algae, and some bacteria convert light energy into chemical energy. sunlight, water, carbon dioxide, organisms glucose, which serves their food. This also oxygen the atmosphere as a byproduct, which is for animal life. Photosynthesis occurs in specialized cell parts called chloroplasts, which contain the green pigment chlorophyll. It is the foundation of nearly all food chains on Earth, making it a vital process for the planet's ecosystems.