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Photosynthesis is the fundamental process by which plants, algae, and some bacteria convert light energy into chemical energy. use , water, carbon dioxide create glucose, which as food. process takes in small organelles chloroplasts, which the green pigment chlorophyll. As a byproduct of this reaction, plants release oxygen into the atmosphere, which is essential for most animal life. Without photosynthesis, the Earth's atmosphere and food chains would be completely different.