Biology help needed?

 A student was put in the same environmental conditions and given the same food and drink for two days. She rested completely on one day and performed regular exercises on the other. The water she lost in sweat and the urine is measured  

 Loss of water 

 

Rest day(Sweat) 100 g 

Rest day(Urine ) 1900 g 

Exercise day (Sweat) - 5000 g 

Exercise day (Urine) - 500g

 

a) Which environmental conditions should be kept the same for the two days? 

b) Why should food and drink be kept the same for the two days? 

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