During investigation we should change only one variable at a time .why

1.	During investigation we should change only one variable at a time .why
Answer» Answer: Testing only ONE variable at a time lets you analyze the results of your experiment to SEE how much a SINGLE change AFFECTED the result. If you're testing two variables at a time, you won't be able to tell which variable was responsible for the result. Explanation: Mark me as branliest

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Answer:

Testing only ONE variable at a time lets you analyze the results of your experiment to SEE how much a SINGLE change AFFECTED the result. If you're testing two variables at a time, you won't be able to tell which variable was responsible for the result.

Explanation:

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During investigation we should change only one variable at a time .why​

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During investigation we should change only one variable at a time .why