Question

A few hours after mixing the dough, the cook weighs the dough and
observes that its weight has decreased.The weight of the dough is the
same at the start of each of the four experiments shown below. Which
two experiments should the cook compare to test if the yeast is the
cause of the loss of weight?​

Answer 1

Answer:

according to me : The cook should compare experiments 3 and 4.