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5 Minute Question. Which reactions in photosynthesis use chlorophyll?. Ready for the Countdown!. 5 minutes. 4 minutes. 3 minutes. 2 minutes. 1 minute. 10 seconds. 9 seconds. 8 seconds. 7 seconds. 6 seconds. 5 seconds. 4 seconds. 3 seconds. 2 seconds. 1 seconds.
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