Why a and b is a chemical change explain it...
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When it is changed to biogas , biogas cannot be turned back to animal waste
So it is a chemical change.
Also the biogas when used by vehicles turn to carbon dioxide and carbon monoxide which cannot br turned to biogas . So both are chemical changes
So it is a chemical change.
Also the biogas when used by vehicles turn to carbon dioxide and carbon monoxide which cannot br turned to biogas . So both are chemical changes
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