Which of the following are good pollution indicators

Options :
  1. Mycorrhiza
  2. Lichens
  3. Mosses
  4. Lianas
Answer and Explanation :-

Answer: Option 2

Explanation:

Lichens grow in pollution free areas and hence are pollution indicators

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Es decir..., lo que yo creo es que el hombre piensa en el significado de la vida porque sabe con certeza que va morir algún día. (...) Nadie sabe lo que va a ocurrir. Por eso nosotros, para evolucionar necesitamos la muerte.
-Haruki Murakami The Wind-Up Bird Chronicle