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Lichens Are Used by Scientists as an Indicator of Pollution

Question 52

Multiple Choice

Lichens are used by scientists as an indicator of pollution because they


A) require nonpolluted water to grow.
B) are extremely sensitive to sulfur dioxide.
C) react to small amounts of carbon monoxide.
D) are very sensitive to ultraviolet radiation.
E) respond to increased levels of chlorofluorocarbons.

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