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Continued Fish Bowl Experimental Design. Testing for Impact of Sunlight

Performing an experiment to test for a relationship between sunlight and the presence of purple goop would require a design that is similar to that which examined the influence of fish on the water. Two identical bowls of water with no fish would be needed with one placed in the sunlight for 24 hours and the other placed in the dark for the same amount of time to act as a control. The hypothesis for such a test is that the water in the sunlight will develop the purple slime over this period. Possible outcomes of this experiment include the prediction that only the water in the sunlight develops slime, that both bowls develop slime, that neither bowl will have slime, and even the possibility that only the bowl in the darkness ends up with slime.