Furosemide and CVT are drugs used to remove excess fluid from the body. Scientistsinvestigated the effect of these drugs on the volume of urine produced by human volunteers. Thescientists used the following method.• They divided volunteers into three groups, A, B and C at random.• They gave all the volunteers the same food for 3 days.• After 3 days, they gave the volunteers in group A a tablet containing furosemide, thevolunteers in group B a tablet containing CVT and the volunteers in group C a placebo (atablet that did not contain either drug).• They then found the mean volume of urine produced by each group in the 4 hours aftertaking the tablets.Some of the results the scientists obtained are shown in Table 1.A value of ± 2 standard deviations from the mean includes over 95% of the data.All the volunteers were given the same food for 3 days.Suggest and explain one reason why they were given the same food.

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