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Biological magnification causes toxins to accumulate and increase in concentration at higher trophic levels, affecting top predators. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept.
Lichens do not grow in polluted areas. Therefore, their absence from a locality can indicate the presence of environmental pollution.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
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