(D) Lichens are symbiotic associations between fungi and algae. They are highly sensitive to sulfur dioxide $(SO_2)$ pollution. They do not grow in po

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(D) Lichens are symbiotic associations between fungi and algae. They are highly sensitive to sulfur dioxide $(SO_2)$ pollution. They do not grow in polluted areas,especially those with high levels of $SO_2$. Therefore,they are widely used as biological indicators of air pollution.