4 why was the white light and dark treatment included

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4.Why was the white light and dark treatment included in the experiment?
5.Graph the percentage (number floating/total disks X 100) of floating disks for each time interval in each beaker. Place the percentage on the y-axis and time on the x-axis. Include all three colors of light on one graph. Graph attached to the back.Lab Activity 2: Table 2UntreatedTimeObservation0 minutesLight green/clear color10 minutesClear on the top, green on the bottom20 minutesClear on the top, green on the bottomDCMUTime Observation0 minutesLight green/clear color10 minutesVery murky green20 minutesDark green
Sodium AzideTime Observation

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