1.

(a) Which gas is vital for the survival of all living organisms?(b) Based on the above answer , explain how humans exchange gases?(c) Name the process of burning of a substance in the presence of air.

Answer» (a) Which gas is vital for the survival of all living organisms?



(b) Based on the above answer , explain how humans exchange gases?



(c) Name the process of burning of a substance in the presence of air.


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