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# Some species of dolphins find their prey by echolocation;

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Some species of dolphins find their prey by echolocation; [#permalink]

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25 Jun 2006, 01:55
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Some species of dolphins find their prey by echolocation; they emit clicking sounds and listen for echoes returning from distant objects in the water. Marine biologists have speculated that those same clicking sounds might have a second function: particularly loud clicks might be used by the dolphins to stun their prey at close range through sensory overload.
Which of the following, if discovered to be true, would cast the most serious doubt on the correctness of the speculation described above?
(A) Dolphins that use echolocation to locate distant prey also emit frequent clicks at intermediate distances as they close in on their prey.
(B) The usefulness of echolocation as a means of locating prey depends on the clicking sounds being of a type that the prey is incapable of perceiving, regardless of volume.
(C) If dolphins stun their prey, the effect is bound to be so temporary that stunning from far away, even if possible, would be ineffective.
(D) Echolocation appears to give dolphins that use it information about the richness of a source of food as well as about its direction.
(E) The more distant a dolphinâ€™s prey, the louder the echolocation clicks must be if they are to reveal the preyâ€™s presence to the hunting dolphin.

Advertisement: The worldâ€™s best coffee beans come from Colombia. The more Colombian beans in a blend of coffee, the better the blend, and no company purchases more Colombian beans than Kreemo Coffee, Inc. So it only stands to reason that if you buy a can of Kreemoâ€™s coffee, youâ€™re buying the best blended coffee available today.
The reasoning of the argument in the advertisement is flawed because it overlooks the possibility that
(A) the equipment used by Kreemo to blend and package its coffee is no different from that used by most other coffee producers
(B) not all of Kreemoâ€™s competitors use Colombian coffee beans in the blends of coffee they sell
(C) Kreemo sells more coffee than does any other company
(D) Kreemoâ€™s coffee is the most expensive blended coffee available today
(E) the best unblended coffee is better than the best blended coffee
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25 Jun 2006, 05:00
B for the first one.

A strengthens the speculation.

B weakens the argument. If the prey is incapable of hearing/perceiving the sound, it can't be stunned.

C is tempting, but it discusses the effect in "far away prey". The text talks about stunning the prey which is nearby.

D can be discounted easily.

E can be discounted easily.

C for the second one. If the company sells more coffee that any other company in the world, it might be using less percentage of the columbian coffee in its blend than the others use.
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25 Jun 2006, 08:17
E

C
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25 Jun 2006, 08:41
Definitely B & C
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26 Jun 2006, 00:14
Can you please elaborate on the 2nd CR?
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26 Jun 2006, 02:25
1) Will go with B.
The speculation is that the dolphins can use echolocation to stun the prey with sensory overload.
But if the echolocation are effective only when they cannot be percieved by the prey, let alone hear them regardless of the volume, the speculation falls flat. As if the prey cannot sense it they cannot be affected by it.

2) Will go with C
If Kremco produces the most then it is reasonable to assume that it purchases the most
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26 Jun 2006, 02:31
will go with B and C
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26 Jun 2006, 02:32
will go with B and C
26 Jun 2006, 02:32
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