Control:  
What is used to COMPARE the results to.  It is the variable in which no independent variable has been applied.


Variable:
Anything that changes in an experiment.  There are 2 types:
           I
ndependent:  What you change on purpose (cause)
           
Dependent: What you observe changing, or
                               What you measure/observe (effect)


Constant:
Anything that stays the same in an experiment to make sure that only the Independent Variable is being changed.
Control, Variables, and Constants
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