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A location with luxuriant growth of lichens on the trees indicates that the:

1. Trees are very healthy
2. Trees are heavily infested
3. Location is highly polluted
4. Location is not polluted

Correct answer: Location is not polluted

Solution

Lichens absorb water and nutrients directly from the air, so they are easily damaged by pollutants. Abundant lichen growth usually means the air is clean, so the location is not polluted.

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