Q. Bioindicators are
A. lichens tracing the presence of pollution
B. fossil lichens
C. a special type of litmus paper
D. None of the above
Answer: lichens tracing the presence of pollution
A. lichens tracing the presence of pollution
B. fossil lichens
C. a special type of litmus paper
D. None of the above
Answer: lichens tracing the presence of pollution
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