Select the correct statement from the following \( \mathrm{P} \) (1...

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Select the correct statement from the following
\( \mathrm{P} \)
(1) A mere \( 0.1 \% \) impurities cannot make domestic
\( \mathrm{V} \) sewage unfit for human use
(2) High concentrations of DDT disturb calcium metabolism in birds.
(3) Phaeophytization in lichens is caused due to nitrogen oxides
(4) 'Bad' ozone as well as 'good' ozone both are found in the upper part of the atmosphere.
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