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Lichens -- North America

Classification
Classification. (2)

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Lichens, Tardigrades, and SO2

Lichens and the tiny animals called tardigrades ("water bears") that live in them are sensitive to certain air pollutants such as sulfur dioxide. Accordingly, they can be useful bioindicators of air quality. Designed to engage students in the scientific process, this Web site, produced by PathFinder Science, offers a learning program based on lichen cover and tardigrade density and diversity on...

http://www.pathfinderscience.net/so2/