LSAT 127 – Section 1 – Question 07

LSAT 127 - Section 1 - Question 07

December 2003

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT127 S1 Q07
+LR
+Exp
Most strongly supported +MSS
A
4%
156
B
7%
158
C
9%
159
D
12%
162
E
68%
164
140
153
166
 +Harder 147.168 +SubsectionMedium

Two different dates have been offered as the approximate end point of the last ice age in North America. The first date was established by testing insect fragments found in samples of sediments to determine when warmth-adapted open-ground beetles replaced cold-adapted arctic beetles. The second date was established by testing pollen grains in those same samples to determine when ice masses yielded to spruce forests. The first date is more than 500 years earlier than the second.

Summary
Two dates have been proposed as the approximate end point of the last ice age in North America:
First Date: Based on the presence of warmth-adapted open-ground beetles replacing cold-adapted arctic beetles in sediment samples.
Second Date: Based on the emergence of spruce forests as indicated by pollen grains found in the same sediment samples.
The first date (beetles) is over 500 years earlier than the second date (spruce forests).

Strongly Supported Conclusions
Warm adapted beetles appeared before the emergence of spruce forests.

A
Toward the end of the ice age, warmth-adapted open-ground beetles ceased to inhabit areas where the predominant tree cover consisted of spruce forests.
There is no information about what happened to warm-adapted beetles after the emergence of spruce forests. The forests emerged *after* the beetles
B
Among those sediments deposited toward the end of the ice age, those found to contain cold-adapted arctic beetle fragments can also be expected to contain spruce-pollen grains.
This is anti supported. The cold beetles came before the warm beetles, which in turn came before the spruce pollen grains. There is no support for them being together.
C
Ice masses continued to advance through North America for several hundred years after the end of the ice age.
The stimulus says nothing about whether ice masses advanced or not.
D
The species of cold-adapted arctic beetle that inhabited areas covered by ice masses died out toward the end of the last ice age.
The stimulus does not give information as to when the ice age *actually* ended (there are just two proposed dates). Thus, it is unreasonable to assume that the cold beetles died towards the end.
E
Toward the end of the ice age, warmth-adapted open-ground beetles colonized the new terrain opened to them faster than soil changes and seed dispersion established new spruce forests.
The stimulus says that the warm-adapted beetles replaced cold-adapted beetles 500 years before the emergence of spruce forests. Thus, it is supported that the beetles colonized the terrain faster than the establishment of the forests.

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LSAT PrepTest 127 Explanations

Section 1 - Logical Reasoning

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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