we can feel it but cant see it, water, electricity, invisibility, air, don't know, all of the above, plants breath carbondoxide and they let out what, nitrogen, oxygen, hydrogen, carbondoxide only, what all are correct in preventing air pollution, walk if its near, take a bus or carpooling, stop burning garbage, stop burning crackers, all of these are corret, true or false - air exerts pressure, T, F, it is very hard, what all things should be stopped to prevent air pollution

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