Homework Help: science

Posted by plz help me on Saturday, April 21, 2012 at 12:00pm.

A doctor advises a patient to change home from the midst of a city to the city outskirts where lichens are found more.what could be the reason behind this advice?

science - Ms. Sue, Saturday, April 21, 2012 at 12:03pm
http://www.earthlife.net/lichens/pollution.html

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