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Manatees, aquatic mammals inhabiting Florida s rivers and

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Director
Joined: 05 Jan 2008
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Manatees, aquatic mammals inhabiting Florida s rivers and [#permalink]

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27 Apr 2008, 12:05
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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 normal
background noise.
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Director
Joined: 06 Jan 2008
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27 Apr 2008, 12:13
almost went with D..still thinking.

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Director
Joined: 18 Feb 2008
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27 Apr 2008, 15:07
E. They are unable to discern the sounds, thus the conclusion is invalid.

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CEO
Joined: 17 May 2007
Posts: 2945

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27 Apr 2008, 23:32
E.
prasannar 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 normal
background noise.

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Current Student
Joined: 17 Jan 2008
Posts: 585

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Location: Ann Arbor, MI
Schools: Ross '12 (MBA/MS)

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28 Apr 2008, 17:22
E.

The conclusion claims that making boats slow down will make things worse. Since the manatees can't tell the difference between the sounds of slow boats, fast boats, or background noise, the number of manatee-boat collisions should remain the same regardless of boat speed.
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Senior Manager
Joined: 26 Mar 2008
Posts: 315

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Location: Washington DC

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30 Apr 2008, 12:21
One more for E. As they cant distinguish sounds of boats traveling with different speed.
Whats the OA?

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Manager
Joined: 27 Jun 2007
Posts: 198

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30 Apr 2008, 12:33
prasannar 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 normal
background noise.

I choose E.

I initially eliminated A, B, and C. I was hesitant on D. The conclusion revolves around manatees hearing boat engines under water and not how far engine noise can travel under water vs. air.

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Manager
Joined: 19 Aug 2007
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30 Apr 2008, 13:16
E.

If the Manatees can not discern the difference between high and low boat speeds then it should not make the situation worse in this case.

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Manager
Joined: 16 Jan 2007
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20 May 2008, 12:27
I feel B is right . We need to weeken the argument which states that 'slowing the boat will turn counter productive '.

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Current Student
Joined: 28 Dec 2004
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Location: New York City
Schools: Wharton'11 HBS'12

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20 May 2008, 12:36
e is best..says the manatee cant tell the noise of a fast boat either..

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Director
Joined: 01 Jan 2008
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08 Jun 2008, 21:03
Although I havent posted the question , the OA is E. I was to post the same question today,

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Re: CR: Manatees   [#permalink] 08 Jun 2008, 21:03
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Manatees, aquatic mammals inhabiting Florida s rivers and

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