Lichens indicate pollution by

Options :
  1. Ozone
  2. SO2
  3. NO3
  4. CO
Answer and Explanation :-

Answer: Option 2

Explanation:

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Hope is not wishful thinking. It's not a temperament we're born with. It is a stance toward life that we can choose...not not. The real question for me, though, is whether m hope is effective, whether it produces or is just where I hide to ease my own pain.
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