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Dogs are colorblind, using smell rather than appearance to

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Dogs are colorblind, using smell rather than appearance to [#permalink] New post 13 Oct 2005, 23:42
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Dogs are colorblind, using smell rather than appearance to navigate their environment. However, although their visual orientation is relatively weak compared to that of humans, many dogs have visually dynamic fur coloration. Since such visual stimulation cannot be appreciated by other dogs, fur markings must serve an evolutionary purpose for dogs other than attracting potential mates.

The supposition above is based on which of the following assumptions?


(A) Fur coloration once enabled dogs to blend in with their environments, making them less conspicuous prey for their natural predators.
(B) All dog traits have an evolutionary function.
(C) Visual stimulation attracts humans to one another more than smell.
(D) Reproduction is the principal purpose of life from an evolutionary standpoint.
(E) Animals with drab fur colorings find mates on criteria other than visual ones.
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 [#permalink] New post 13 Oct 2005, 23:55
go B go....
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 [#permalink] New post 15 Oct 2005, 09:04
OA is B.

Explanation:
ID Question Type and Task
Assumption Question
Task: Find the assumptions.

Read the Argument and Extract Necessary Information:
The argument states that the fur markings must serve some other evolutionary purpose since it does not serve the purpose of attracting a mate. However this makes the assumption that all things serve an evolutionary purpose.

Formulate an Answer to the Question
The assumptions are the answer so no need.

Eliminate Answer Choices:
(A) Not assumed. The arguments pertain to what purpose the fur markings and coloration currently serve not what purpose was served in the past.

(B) Keep.The argument is making assumptions about the evolutionary purpose of traits of dogs (specifically fur markings).

(C) Not Assumed. The argument makes no assumption about humans.

(D) Not assumed. Assumptions connect premises and the conclusion if something is addressed in neither a Premise or a conclusion it cannot be an assumption. The purpose of life is neither a premise nor a part of the conclusion and thus has no relevance in this argument.

(E) Not assumed. Assumptions connect premises and the conclusion if something is addressed in neither a Premise or a conclusion it cannot be an assumption. The animals with drab colorings is neither a part of a premise nor a part of the conclusion and thus have no relevance in this argument.
  [#permalink] 15 Oct 2005, 09:04
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