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What is a controlled variable in an experiment?
a
b
A factor that is purposely left the same.
A factor that is purposely changed and being measured.
A factor that will be observed and measured.
A factor that is purposely being changed.
С
d A factor that is purposely being changed

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Answer:

A factor that is purposely left the same.

Explanation:

A controlled variable should not be changed throughout an experiment or else it will affect the outcome of each individual trial.
A the factor that is purposely changed

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