Manatees, aquatic mammals inhabiting Florida s rivers and : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 16 Jan 2017, 23:31

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Manatees, aquatic mammals inhabiting Florida s rivers and

Author Message
TAGS:

### Hide Tags

Intern
Joined: 02 Sep 2006
Posts: 41
Followers: 0

Kudos [?]: 38 [0], given: 0

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

### Show Tags

11 Dec 2006, 16:06
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:54) correct 0% (00:00) wrong based on 1 sessions

### HideShow timer Statistics

Manatees, aquatic mammals inhabiting Floridaâ€™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 boatâ€™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 Floridaâ€™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.

If you have any questions
New!
Senior Manager
Joined: 04 Nov 2006
Posts: 268
Location: California
Followers: 1

Kudos [?]: 192 [0], given: 0

### Show Tags

11 Dec 2006, 16:44
D...
VP
Joined: 21 Mar 2006
Posts: 1134
Location: Bangalore
Followers: 3

Kudos [?]: 40 [0], given: 0

### Show Tags

11 Dec 2006, 19:36
Good question. Give me E!

E shows that the manatees cannot distinguish the sounds of the boats over normal sound irresepective of whether the boats are fast or slow. So the situation will not worsen.
Senior Manager
Joined: 08 Jun 2006
Posts: 340
Location: Washington DC
Followers: 1

Kudos [?]: 48 [0], given: 0

### Show Tags

11 Dec 2006, 20:11
kripalkavi wrote:
Good question. Give me E!

E shows that the manatees cannot distinguish the sounds of the boats over normal sound irresepective of whether the boats are fast or slow. So the situation will not worsen.

Good question and equally good response by kripalkavi
SVP
Joined: 08 Nov 2006
Posts: 1559
Location: Ann Arbor
Schools: Ross '10
Followers: 14

Kudos [?]: 189 [0], given: 1

### Show Tags

11 Dec 2006, 20:43
E.
_________________

My Profile/GMAT/MBA Story
http://www.gmatclub.com/forum/111-t59345

GMAT Club Premium Membership - big benefits and savings

11 Dec 2006, 20:43
Similar topics Replies Last post
Similar
Topics:
32 Manatees, aquatic mammals inhabiting Florida s rivers and 30 19 Jun 2010, 08:25
1 Manatees, aquatic mammals inhabiting Florida s rivers and 7 19 Feb 2009, 09:45
Manatees, aquatic mammals inhabiting Florida s rivers and 10 27 Apr 2008, 11:05
Manatees, aquatic mammals inhabiting Florida s rivers and 7 06 Oct 2007, 18:46
Manatees, aquatic mammals inhabiting Florida s rivers and 6 01 Jun 2007, 08:48
Display posts from previous: Sort by