GMAT PREP 1

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by Suyog » Tue Aug 19, 2008 3:30 am
Conclusion : Something other than Herbicide must be responsible for the population decrease.

Weaken... So we have say that "Herbicide is responsible for the population decrease."

1 says...

Use of Herbicide -- > Elimination of weeds --> reduced population of small insects --> hungry partridge --> decrease in partridge population