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Lichens are useful because they act as indicators of:

APrecipitation
BPhotoperiod
CPollution
DPredation
Answer & Solution
Correct answer: C. Pollution
1. Lichens will not grow where the air is dirty. 2. Their presence therefore says something about the air. 3. They are good pollution indicators. _Source: syllabus Biology, Ch 2 'Biological Classification'_
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