Your response should contain at least 5 sentences and less than 10 sentences. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. Include keywords *chloroplasts, sunlight, glucose, oxygen*. In your response, the word *photosynthesis* should appear at least 2 times. At the end of your response, please explicitly add a postscript starting with *P.S.*.
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