Akela wrote:
For the last three years, entomologists have been
searching for a parasite to help control a whitefly that
has recently become a serious crop pest. Believing
this new pest to be a variety of sweet-potato whitefly,
the entomologists confined their search to parasites
of the sweet-potato whitefly. Genetic research now
shows the new pest to be a distinct species, the
silverfleaf whitefly. Therefore, the search for a
parasite has so far been wasted effort.
Which one of the following is an assumption
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