Which one of the following is the well known example of bioi

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Which one of the following is the well known example of bioindicator of air pollution?

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[UPPSC 2019 GS P1]

Lichens

लाइकेन

Methyl mercury

मिथाइल मरकरी

Rose plant

गुलाब का पौधा

Sunflower

सूरजमुखी