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Manatees, aquatic mammals inhabiting Florida s rivers and

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Re: Manatees, aquatic mammals inhabiting Florida s rivers and [#permalink]

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New post 22 Jul 2017, 18:40
ykaiim wrote:
Manatees, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats. To address the problem, boat traffic in manatee-populated waters is being required to maintain very low speeds. Unfortunately, manatees are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boat slows. Therefore, this approach may in fact make things worse rather than better.

Which of the following, if true, casts most doubt on the conclusion?

A. The areas where boats would have to maintain low speeds were decided partly on the basis of manatee-population estimates and partly from numbers of reported collisions between manatees and boats.
B. Because the water hyacinth that manatees feed on grows best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-moving boat traffic.
C. Over the last several decades, boat traffic in Florida’s coastal waters has been increasing almost continuously and now represents the greatest threat to the endangered manatee population.
D. The sound of a boat engine generally travels much further under water than it does through the air.
E. When experimenters exposed manatees to the recorded sounds of boats moving at various speeds, the creatures were unable to discern the sounds over normalbackground noise.

I marked the OA by PoE, but I was not much clear on the argument. Can someone explain on the argument and answer choice?


A) Irrelevant to the conclusion. The source of the areas in which boaters must maintain low speeds does not cast doubt on the conclusion.
B) Whether the food source is harmed does not have any bearing on the reduction of boat fatalities of the manatee.
C) That could well be true, but if anything it serves to bolster the conclusion, not weaken it.
D) This fact does not make the conclusion that the reduced boat speeds will make things worse less likely to be true.
E) Correct. If manatees cannot hear the boat engine at any speed, then reducing boat speeds is not going to make the animals more likely to die in boat fatalities. This new info casts doubt on the conclusion that boats traveling at slower speeds will "make things worse" for manatees.
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Re: Manatees, aquatic mammals inhabiting Florida s rivers and [#permalink]

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New post 26 Jul 2017, 09:33
Merged topics. Please, search before posting questions!
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Manatees, aquatic mammals inhabiting Florida s rivers and [#permalink]

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New post 07 Sep 2017, 10:22
amp0201 wrote:
Shell game is like the answer choice most similar to correct one, though not the correct one.

The argument's conclusion is - slower boats might worsen the problem.

Answer choice E says Manatees are not able to hear noises at any levels. Hence the problem won't worsen but will stay same.

Answer choice B is about faster boats and nothing to say about slower boats.

Hence I believe to be E rather than B. Thank You.

Thanks,
Akhil M.Parekh


Just to add shell game answer generally try to answer some other conclusion. In this it is trying to say tat since the food is damaged by fast moving boat, slow moving boat will not cause that damage and hence save the dying population. But the conclusion was that the slow moving boat causes less alertness to the mantees, resulting in higher death. SO yes B helps to say that slow moving boat might help to increase chances of mantees' population, but option fails to answer the issue of alertness.

P.S. Maybe alertness of mantee is much more important than the damaged food
Manatees, aquatic mammals inhabiting Florida s rivers and   [#permalink] 07 Sep 2017, 10:22

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