Biology, 11.07.2019 08:00 jollyjinkings
Which of the following statements about a controlled experiment is true? a. all the variables must be kept the same b. only one variable is tested at a time c. controlled experiments cannot be performed on living things d. everything can be studied by setting up a controlled experiment
Answers: 1
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Which of the following statements about a controlled experiment is true? a. all the variables must...
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