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•The setup of the materials was not followed properly or in the exact same way.
•Similar procedures were not followed in the exact same way.
•Appropriate tools were not chosen to complete the experiment.
•Tools were not used properly.
•Measurements were not taken accurately.
•Different observations were collected.
•Mistakes were made when recording data, such as numbers written incorrectly.
What are reasons why the same experiment might produce different results?