5. Which of the following statements about a con-
trolled experiment is true?
a. All the vari...
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5. Which of the following statements about a con-
trolled experiment is true?
a. All the variables must be kept the same.
b. Only one variable is tested at a time.
c. Everything can be studied by setting up a con-
trolled experiment.
d. Controlled experiments cannot be performed
on living things.
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Answers: 3
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