GMAT Verbal Reasoning Practice Test 7

Question : 29 of 100

Marks: +1, -0

Ecologist: Nonnative species probably have much more difficulty becoming established in robust, diverse ecosystems than in other ecosystems. An invasive species suited for a particular ecosystem that is already occupied by a wide variety of native species cannot become established unless it outcompetes the native species in that ecosystem.
Which of the following, if true, would most weaken the ecologist’s argument?

Most invasive species thrive in an ecosystem only if the ecosystem is not already occupied but several native species
The native ecosystems of most, if not all, invasive species were robust and diverse
In general, in any given diverse ecosystem, any species invading that ecosystem will have to outcompete at least one native species to become established in that ecosystem
On average, the less diverse an ecosystem is, the less hospitable that ecosystem is to invasive species
Even if nonnative species have far more difficult becoming established in robust, diverse ecosystems, many succeed in doing so

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