(A) Lichens are symbiotic organisms consisting of algae and fungi. They are highly sensitive to air pollution,particularly sulfur dioxide $(SO_2)$. Be

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(A) Lichens are symbiotic organisms consisting of algae and fungi. They are highly sensitive to air pollution,particularly sulfur dioxide $(SO_2)$. Because they cannot survive in environments with high levels of industrial pollutants,they are widely used as bio-indicators to assess air quality in industrial regions.