You may find the answer to your question in this website: http://answers.yahoo.com/question/index?qid=20080615165001AABZ33wCopy paste it:-)
only difference is the variable doesnt change.....i think =D
The constant control set up is where you have every thing "normal" to use to compare your experimental set up with the variable to. This has no variables and is always constant. For example if you...
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were you setup your own experiment
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