Old cemeteries (pre-1900 ) often have gravestones that often host many types of lichens. However, it is not impossible to find old cemeteries where lichens are entirely absent. Given what is known about lichens, an old cemetery without lichens probably

A) has an unusually dry climate.
B) is subject to extremely cold winter temperatures.
C) gets a great deal of rain, which favors the growth of competing bacteria.
D) is close to a source of air pollution.


Answer: D

Biology & Microbiology

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