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Suppose that the number of kinds of lichens at a city park s decreasing each year. What might explain this disappearance?

Suppose that the number of kinds of lichens at a city park s decreasing each year. What might explain this disappearance?
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Suppose that the number of kinds of lichens at a city park s decreasing each year. What might explain this disappearance?

User Ylangylang
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1 Answer

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Lichens decrease in the park because are very sensitive to pollution.
User Uttam Panchasara
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