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11 Mar 2011, 09:28
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C
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Difficulty:
35%
(medium)
Question Stats:
86% (01:30) correct
14%
(02:44)
wrong
based on 14
sessions
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The top 50 centimeters of soil on Tiliga Island contain
bones from the native birds eaten by the islanders since
the first human immigration to the island 3,000 years
ago. A comparison of this top layer with the underlying
150 centimeters of soil—accumulated over 80,000
years—reveals that before humans arrived on Tiliga, a
much larger and more diverse population of birds lived
there. Thus, the arrival of humans dramatically
decreased the population and diversity of birds on
Tiliga.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) The bird species known to have been eaten by
the islanders had few natural predators on
Tiliga.
(B) Many of the bird species that disappeared from
Tiliga did not disappear from other, similar,
uninhabited islands until much later.
(C) The arrival of a species of microbe, carried by
some birds but deadly to many others,
immediately preceded the first human
immigration to Tiliga.
(D) Bones from bird species known to have been
eaten by the islanders were found in the
underlying 150 centimeters of soil.
(E) The birds that lived on Tiliga prior to the first
human immigration generally did not fly well.
bones from the native birds eaten by the islanders since
the first human immigration to the island 3,000 years
ago. A comparison of this top layer with the underlying
150 centimeters of soil—accumulated over 80,000
years—reveals that before humans arrived on Tiliga, a
much larger and more diverse population of birds lived
there. Thus, the arrival of humans dramatically
decreased the population and diversity of birds on
Tiliga.
Which one of the following statements, if true, most
seriously weakens the argument?
(A) The bird species known to have been eaten by
the islanders had few natural predators on
Tiliga.
(B) Many of the bird species that disappeared from
Tiliga did not disappear from other, similar,
uninhabited islands until much later.
(C) The arrival of a species of microbe, carried by
some birds but deadly to many others,
immediately preceded the first human
immigration to Tiliga.
(D) Bones from bird species known to have been
eaten by the islanders were found in the
underlying 150 centimeters of soil.
(E) The birds that lived on Tiliga prior to the first
human immigration generally did not fly well.
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11 Mar 2011, 10:41
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This is causal argument. An alternate cause of the extinction of the birds will weaken the conclusion that bird population dwindled due to humans. That's B
vjsharma25
