Answer:
Testing Platismatia glauca could help scientists understand which pollutants have the largest effect on lichen populations. It also may help scientists understand the current pollutant levels in the atmosphere compared to the population of lichens on the trees. This information can help them more accurately predict population changes over time.
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The correct answer for this question would be option D. Since the Gulf Stream is a warm water current that flows away from the equator to northern Europe, the cause for this would be most likely the <span>warm climates in northern Europe. Hope this answers the question. Have a great day!</span>