A researcher has been studying lichens in his hometown. Since he began his study, he has noticed several lichens dying in the vicinity of a new factory. What is MOST likely causing the decrease in lichen populations? A)the diversion of water sources to the factory (i.e., lichens are drying out) B)an increase in air temperature, which is the result of CO₂ emissions from the factory C)the blocking of sun by the factory (i.e., the lichens aren't getting enough sunlight) D)an increase in industrial pollutants in the area

Question

Quizplus · Accepted Answer

The most likely cause of the decrease in lichen populations is an increase in industrial pollutants in the area. Lichens are sensitive to pollution and can be used as indicators of air quality. The emissions from the factory may be depositing harmful chemicals onto the lichens, causing their death.

A Researcher Has Been Studying Lichens in His Hometown