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Aivsta

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  1. Does anyone know how Leonardo Da Vinci used the scientific method? I was readying an article and it concluded with this question. I would realy like to know. And if possible, if you could provide some evidence how.
  2. substances like water and salt, or kool-aid and water, or makeing coffee.
  3. can somone tell me if i mixing two substances is a chemical change. If so please state why, and if not please state why as well. P.S please answer asap.
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