Fact 1: Of the two elements that keep leaf beetle populations in check -- predators and parasites -- only predators are adversely affected by severe air pollution.
Fact 2: In areas with severe air pollution, leaf beetles cause particularly severe damage to willows.
Pre-thinking :
The correct answer choice must explain why leaf beetles cause particularly severe damage to willows in areas with severe air pollution, even though air pollution does not adversely affect parasites. Few speculations:
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...
Fact 2: In areas with severe air pollution, leaf beetles cause particularly severe damage to willows.
Pre-thinking :
The correct answer choice must explain why leaf beetles cause particularly severe damage to willows in areas with severe air pollution, even though air pollution does not adversely affect parasites. Few speculations:
-
...
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