Lichens Take Up Nutrients and Pollutants from Airborne Dust, So

question 17

Multiple Choice

Lichens take up nutrients and pollutants from airborne dust, so many cannot survive where the level of air pollution is high. The U.S. Forest Service monitors lichens on tree trunks as part of its program to assess the health of forest communities. In this regard, lichens serve as a(n) ____.

• A)pioneer species
• B)indicator species
• C)endemic species
• D)keystone species
• E)exotic species

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Definitions:

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A perspective or belief held in common across diverse cultures or societies.

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The collective feeling of pride and allegiance that citizens have towards their country.

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A traditional story, often involving supernatural beings or events, that serves to explain natural phenomena or cultural practices.

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