Question

What kind of environmental indicator is lichen?​

Answer 1

Answer:

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Explanation:

Lichens are well known as sensitive indicators of air pollution, particularly for sulfur dioxide. In part, this is related to their unique biology.

Answer 2

Answer:

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Explanation:

Lichens have been used as a biological indicator for air pollution since 1866, when epiphytic lichens were used to assess the air pollution for the local area (Nylander, 1866).