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the data shown were collected in a laboratory experiment in which the effect of ph on the survival of water fleas (daphnia pulex) was examined. in each trial, 40 live water fleas were added to a solution with the ph as indicated. after two hours, observations were made to determine the number of fleas remaining alive in the sample. results are presented in the table and in graphical form above. how would including a control group be useful in this experiment?