A student is participating in the school science fair. She wants to investigate household cleaners.Which question can she best answer through scientific investigation?

She can test how well different cleaners remove the same type of stain under the same conditions, then compare the results. That makes “Which household cleaner is most effective at removing stains?” a question she can investigate scientifically. Smell preference, cleaning frequency, and where to buy cleaners depend more on personal judgment or circumstances.

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