The presence of lichens in an area, indicates ___________ area.

Clean

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Polluted

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Oxygen-rich

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Crowded

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Solution

The correct option is D Clean
Lichens are well known as sensitive indicators of air pollution. They are found to be very sensitive to the levels of contaminants like sulphur dioxide in the air.Air pollutants can damage lichens and prevent them from growing. This makes lichens natural indicators of air pollution. Lichens are found in a clean environment that is free from air pollution.
So, the correct answer is option A.

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