GMAT Practice Question Set #25 (Question 73-75)

Critical Reasoning Question #73: Otter and Eel Population  
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Waldwick’s otter population has been declining in recent years, primarily because of hunting. Otters prey heavily on a species of water eel that is highly valued as food by Waldwickers, who had hoped that the decline in the otter population would lead to an increase in the numbers of these water eel available for human consumption. Yet the population of this water eel species has also declined, even though the annual number caught for human consumption has not increased.

Which of the following, if true, most helps to explain the decline in the population of the water eel species?


The decline in the otter population has meant that water eel catchers can work in some parts of lakes and rivers that were formerly too dangerous.


Over the last few years, Waldwick's commercial water eel capture expeditions have increased the number of capture boats they use.


The main predator of the water eel is a species of fish on which otters also prey.


Many Waldwickers who hunt otters do so because of the high market price of otter skins, not because of the threat otters pose to the water eel population.


In several neighboring countries through which Waldwick's rivers also flow, otters are at risk of extinction as a result of extensive hunting.

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