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Lichens indicate SO₂ pollution because they

1. show association between algae and fungi
2. grow faster than others
3. are sensitive to SO₂
4. flourish in SO₂ rich environment

Correct answer: are sensitive to SO₂

Solution

Lichens are highly sensitive to sulfur dioxide, so they decline or disappear in polluted air. Because of this, their presence or absence is used to indicate SO₂ pollution.

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