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The author concludes that tour groups meant to protect butterfly habitats are actually harming the monarch butterfly population. She supports this hypothesis by saying that the tourists damage most small shrubs, which are essential for the survival of butterflies that fall from the trees.
The author assumes that tourists destroying the shrubs is enough to threaten the entire monarch population. To make this assumption, she must also believe that the monarchs that fall from the trees make up a significant portion of the entire population, so that, by endangering the subset of monarchs that fall off the trees, the tourists also endanger the population as a whole.
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