It depends on the experiment. It could be what the food is, the storage temperature, time, humidity or many other possible factors that affect spoilage.
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Example: the amount of food is the independent variable because it has been changed and the growth of chickens is the dependent variable because the growth will be effected by the amount of food. Growth depends on the food
The independent variable.
the dependent variable changes with the independent variable. the independent variable only changes when changed by the experimenter. Time is usually an independent variable.
An independent variable is a factor that doesn't rely on anything, unlike the dependent variable (which relies on the independent variable). The most common independent variable is time.
The independent variable is the variable which you change. It is not changed by any outside factors and so is independent of them.The dependent variable is the variable which is changed by the independent variable changing and which you measure. It is dependent on another variable.