Select the correct statement from the following
Select the correct statement from the following
- A
A mere $0.1\;\%$ impurities cannot make domestic sewage unfit for human use
- B
High concentrations of $DDT$ disturb calcium metabolism in birds.
- C
Phaeophytization in lichens is caused due to nitrogen oxides
- D
‘Bad’ ozone as well as ‘good’ ozone both are found in the upper part of the atmosphere.
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