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Biologist: Marine animals known as box jellyfish have eyes with well-

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Biologist: Marine animals known as box jellyfish have eyes with well- [#permalink]

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New post Updated on: 05 Feb 2018, 11:23
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Biologist: Marine animals known as box jellyfish have eyes with well-formed lenses capable of producing sharp images that reveal fine detail. But the box jellyfish's retinas are too far forward to receive a clear image, so these jellyfish can receive only a blurry image that reveals prominent features of objects but not fine detail. This example shows that eyes are adapted only to an animal's needs rather than to some abstract sense of how a good eye would be designed.

The argument requires assuming which one of the following?

(A) Box jellyfish are the only kind of jellyfish with retinas that do not focus clearly.
(B) Box jellyfish have a need to detect prominent features of objects but not fine details.
(C) Box jellyfish would benefit from having retinas that allowed their eyes to focus more sharply.
(D) Box jellyfish developed from jellyfish whose retinas received clear images.
(E) Box jellyfish use vision as their main means of detecting prey.

Source: LSAT
[Reveal] Spoiler: OA

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Originally posted by Akela on 16 Dec 2017, 10:25.
Last edited by Akela on 05 Feb 2018, 11:23, edited 1 time in total.
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Re: Biologist: Marine animals known as box jellyfish have eyes with well- [#permalink]

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New post 17 Dec 2017, 05:46
Hey Akela!
The answer is (B).
Reason: we are told the jellyfish's eyes are designed in a way that allows them to see "prominent features of an object but not fine details", and are then told that this proves that the eyes are designed to fit animal's needs. In other words, the argument equates the animal's needs with detecting prominent features, not fine details - exactly what (B) tells us.
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Re: Biologist: Marine animals known as box jellyfish have eyes with well-   [#permalink] 17 Dec 2017, 05:46
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Biologist: Marine animals known as box jellyfish have eyes with well-

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