Lichens can be used as air pollution indicators, especially of the concentration of sulfur dioxide in the atmosphere. Lichens are plants that grow in exposed places such as rocks or tree bark. They need to be very good at absorbing water and nutrients to grow there.
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October 16, 2016 at 10:00 pm
How can you tell if the lichen has grown in an area of high sulfur dioxide concentration or low sulfur dioxide concentration?