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In a polluted area around the Great Lakes, scientists

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In a polluted area around the Great Lakes, scientists [#permalink] New post 05 Oct 2010, 09:01
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A
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C
D
E

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  5% (low)

Question Stats:

65% (01:40) correct 35% (02:18) wrong based on 17 sessions
In a polluted area around the Great Lakes, scientists studying bird populations have observed a drop in the number of both herring gulls and terns. Both bird species prey on the same type of fish, whose numbers are also being negatively affected by pollution. However, the tern population has seen a much sharper decrease than the herring gull population. Scientists have concluded that the herring gulls have a higher survival rate because they are able to find alternative sources of food, including garbage dumps along the shoreline.

Which of the following, if true, would provide the best piece of evidence in support of the researchers’ conclusion?

* A survey shows that bird populations in areas around the Great Lakes have shown similar decreases.
* A related study finds that fish populations in the Great Lakes are affected as much by other predators as by pollution.
* Maps of the area reveal that the largest garbage dump in the area is located 3 miles inland from the lake.
* Blood tests performed on the gulls reveal high levels of the types of fatty acids generally found only in human food.
* Analysis of water in the area where the birds nest reveals that toxin levels are actually slightly below fish tolerance levels.

Why can't C be the best answer ?
[Reveal] Spoiler: OA

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Re: Dig Test Q#10 [#permalink] New post 05 Oct 2010, 09:29
Conclusion: herring gulls have a higher survival rate because they are able to find alternative sources of food, including garbage dumps along the shoreline.
==>So need to prove herring gulls eat food from garbage dumps.

* A survey shows that bird populations in areas around the Great Lakes have shown similar decreases.
>> Does not talk abour herring gulls.
* A related study finds that fish populations in the Great Lakes are affected as much by other predators as by pollution.
>> Not related to conclusion.
* Maps of the area reveal that the largest garbage dump in the area is located 3 miles inland from the lake.
>> This does not necessarily mean that herring gulls feed on garbage dumps.
* Blood tests performed on the gulls reveal high levels of the types of fatty acids generally found only in human food.
>> Yes. So if the gulls have high levels of fatty acids generally found in human food, means they feed on the garbage dumps that have human food wastes.
* Analysis of water in the area where the birds nest reveals that toxin levels are actually slightly below fish tolerance levels.
>> Not related.
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Re: Dig Test Q#10 [#permalink] New post 05 Oct 2010, 10:24
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doesn't survival depend on, how far they go to find alternative sources food rather than alternative sources of food themselves. including garbage dumps along the shoreline. garbage dumps are including in the alternative sources of food not exactly one alternative source of food, they could feed on other decompose materials... on plants.... insects... etc....
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Re: Dig Test Q#10 [#permalink] New post 05 Oct 2010, 21:03
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D for me. But It took me close 2.5 minutes. I believe that "Scientists have concluded that the herring gulls have a higher survival rate because they are able to find alternative sources of food" points to the answer. Scientist concluded that gulls are able to find alternative sources of food. and the option D substantiates that.
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Re: Dig Test Q#10   [#permalink] 05 Oct 2010, 21:03
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