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The control group stays the same throughout the entire experiment.
To have something to compare the rest of the experiment to
A control setup is something where you know how it will behave. It gives you a reference to measure affect of all other variables.
the purpose of doing an experiment is to discover new things
All science experiments are performed in a controlled manner which means, there will be a positive control, a negative control and importantly the subject sample(s) who's behavior is not known. The experimental observation must be positive with the positive control sample and negative with the negative control sample, no matter whatever the condition is. Only in this set up the result of a subject (which is the actual unknown experimental sample) would be considered as a faithful result.Any fault or irregularities of the controls will destroy the authenticity of an experiment.