LSAT 51 – Section 3 – Question 18

LSAT 51 - Section 3 - Question 18

December 2006

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT51 S3 Q18
+LR
Necessary assumption +NA
A
7%
161
B
59%
167
C
21%
163
D
3%
158
E
10%
160
150
161
172
 +Hardest 147.633 +SubsectionMedium

The eye of the mantis shrimp is likely the most complex visual organ in all of the animal kingdom. Each of its parts must be present and function with the other parts in order for its vision to render polarized light and multispectral images. Therefore, an ancestor of the mantis shrimp with only a few of those parts would have gained no survival advantage.

Come on!

Do you see how terrible this argument is? It's presuming that say, a simple eye that could, say, only perceive vague shapes in low resolution in black and white, is useless. How obviously, flagrantly, false.

But, we have to find a necessary assumption for this terrible argument.

To keep this argument alive, we must establish that for parts of the mantis shrimp eye to have aided survival, it must have helped it to render polarized light and multispectral images.

Imagine if we negated this assumption. So, parts of the mantis shrimp eye that could not render polarized light and multispectral images (in other words, the "simple eye" that could only make out vague shapes) could still aid survival. Well, yeah, now the terribleness of the argument comes to light.

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LSAT PrepTest 51 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logic Games

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