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in an experiment we usually make two or more set ups. the first set up where all the conditions are normal is known as the control. the rest of the set ups which may have different conditions is called as the variable set up.

example:

suppose we are performing an experiment to check the growth of plants in absence of carbon dioxide.

The control will have carbon dioxide (normal condition).

the variable will not have carbon dioxide.

this is done for a comparison between normal and abnormal conditions.

Thank you.

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13y ago

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