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Lichens are the best indicator of

Correct Answer: Air pollution

Explanation:

1. Lichens are plants that grow in exposed places such as rocks or tree bark.


 


2.  Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.  


 


3. They need to be very good at absorbing water and nutrients to grow there.


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