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its true that sun 's ultra voilet rays can harm our skin and we can suffer skin deasease but if we did more pollution we would suffer from it because pollution makes ozone layer decrease to pevent we should notdo pollution , which only a way to prevent
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Explanation: they know what oxygen is. so in 1st picture there are two free single atoms(parmanu: in hindi) of oxygen and two dual oxygen molecule(O2). in second picture one single atom is combining with one molecule. and in third picture ozone is formed by joining of one single atom of oxygen with one molecule of oxygen
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