A location with luxuriant growth of lichens on the trees indicates that the:-
(a) trees are very healthy
(b) trees are heavily infested
(c) location is highly polluted
(d) location is not polluted
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 SO2 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.