A) trees are very healthy
B) trees are heavily infested
C) location is highly polluted
D) location is not polluted
Correct Answer: D
Solution :
The situation suggests that the site is no polluted as lichens are the bioindicators for air pollution. These are the living organisms that respond in an especially clear way to a change in the environment. The lichens are useful indicators of especially \[S{{O}_{2}}\] pollution because they derive their water and essential nutrients mainly from the atmosphere rather than from the soil. Detritivores (earthworm) is a detrivore which break down detritus into smaller particles.
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