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Plants that exhibit certain leaf diseases tend to measure extremely high in the amount of zinc in their leaf and stem tissue. Botanists have discovered that phosphorus of the type typically used in a phosphorus-high fertilizer reacts with the zinc in such a way as to prevent treated plants from exhibiting the leaf diseases. Thus, plants can be cured from these leaf diseases by the use of a fertilizer high in phosphorus.
The passage’s conclusion is based upon which one of the following premises?