medium · GMAT Verbal Reasoning
To save a southern pine from warming, foresters plan to plant it hundreds of miles north. A botanist warns: every batch of these pines they tested carried a fungus harmless to the southern pine but lethal to the northern firs already growing there.
Which of the following must be true based on these statements?
- Planting the southern pines far up north will definitely kill the resident northern firs.
- Every tested batch of the southern pines carried a fungus lethal to northern firs.
- This particular fungus is the only threat that the northern firs face.
- The southern pine simply cannot survive within its current southern range at all.
- Without this deliberate assisted migration, the southern pine species would surely go extinct.
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