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

Question

Quizplus · Accepted Answer

Lichens are very sensitive to air pollution. In areas with high levels of air pollution, lichens may not be able to survive due to the toxic substances present in the air. This is why an old cemetery without lichens is likely close to a source of air pollution.

Old Cemeteries (Pre-1900) Often Have Gravestones That Often Host Many