Which scenario is an example of a physical change? Wood is burned in a campfire and is turned into ash and smoke. A piece of met

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Which scenario is an example of a physical change?
Wood is burned in a campfire and is turned into ash and smoke.
A piece of metal is left in the rain and forms rust.
Lead is melted into a liquid to form pellets.
Yeast turns sugar into energy, water, and carbon dioxide gas.

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