A) air pollution
B) water pollution
C) soil pollution
D) agriculture productivity
Correct Answer: A
Solution :
Lichens are composite organisms consisting of a symbiotic association of a fungus with a photosynthetic partner, usually either a green alga or cyanobacterium. Lichens are widespread and may be long-lived. However, many species are vulnerable to environmental disturbance and may be useful to scientists in assessing the effects of air pollution, ozone depletion and metal contamination.
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