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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