Ok so I am doing a project on "what material best absorbs olive oil" I am using styrofoam, cat litter, and clay soil as the products that are absorbing olive oil, but I cant think of a control group. Does anyone have an idea of what my control would be? Thanks in advance!
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I don't see why you'd need a control group but you could always use things like paper towels, cloth towels and cotton wool to see if your proposed materials are better.