Anaerobic bacteria digest animal waste and produce biogas (change-A). the biogas is then burnt as a fuel (change-B). the following statements pertain to these changes. choose the correct one. 1. process-A is a chemical change
2. process B is a chemical change
3. Both processes A and B are chemical changes
4. None of these processes is a chemical change
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i think it is
None of these processes is a chemical change
None of these processes is a chemical change
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