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biology, botany, carbon, chemical, chlorophyll, co2, color, design, diagram, dioxide, drawing, education, educational, energy, environment, explain, flower, foliage, global, graphic, green, growth, icon, illustration, image, leaf, life, light, natural, nature, new, organic, oxygen, photosynthesis, plant, process, respiration, scheme, science, spring, stem, sugar, sun, sunlight, symbol, synthesis, tree, warming, water,