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A group of students is trying to determine which detergent will best remove an oil stain. They stain five separate cloths with oil and then wash each of the cloths in a different detergent. They repeat
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A group of students is trying to determine which detergent will best remove an oil stain. They stain five separate cloths with oil and then wash each of the cloths in a different detergent. They repeat each test two more times. Which step should be included in their investigative plan?

User Kohske
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Answer:

Place each oil stain on separate, but identical, pieces of cloth.

Step-by-step explanation:

User Andreas Profous
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