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1000Cr-->Lsat 25-->SecIV-->Q22

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nishant_1010 Junior | Next Rank: 30 Posts
Joined
05 Jan 2007
Posted:
14 messages
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1000Cr-->Lsat 25-->SecIV-->Q22

Wed May 02, 2007 9:18 pm
22. Dinosaur expert: Some paleontologists have claimed that birds are descendants of
a group of dinosaurs called dromeosaurs. They appeal to the fossil record, which indicates that dromeosaurs have characteristics more similar to birds than do most
dinosaurs. But there is a fatal flaw in their argument; the earliest bird fossils that
have been discovered date back tens of millions of years farther than the oldest
known dromeosaur fossils. Thus the paleontologists' claim is false.
The expert's argument depends on assuming which one of the following?
(A) Having similar characteristics is not a sign that types of animals are
evolutionarily related.
(B) Dromeosaurs and birds could have common ancestors.
(C) Knowledge of dromeosaur fossils and the earliest bird fossils is complete.
(D) Known fossils indicate the relative dates of origin of birds and dromeosaurs.
(E) Dromeosaurs are dissimilar to birds in many significant ways.

Ans D. I chose C why is C wrong and D correct

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jayhawk2001 Community Manager
Joined
28 Jan 2007
Posted:
789 messages
Followed by:
1 members
30
Wed May 02, 2007 9:40 pm
nishant_1010 wrote:
22. Dinosaur expert: Some paleontologists have claimed that birds are descendants of
a group of dinosaurs called dromeosaurs. They appeal to the fossil record, which indicates that dromeosaurs have characteristics more similar to birds than do most
dinosaurs. But there is a fatal flaw in their argument; the earliest bird fossils that
have been discovered date back tens of millions of years farther than the oldest
known dromeosaur fossils. Thus the paleontologists' claim is false.
The expert's argument depends on assuming which one of the following?
(A) Having similar characteristics is not a sign that types of animals are
evolutionarily related.
(B) Dromeosaurs and birds could have common ancestors.
(C) Knowledge of dromeosaur fossils and the earliest bird fossils is complete.
(D) Known fossils indicate the relative dates of origin of birds and dromeosaurs.
(E) Dromeosaurs are dissimilar to birds in many significant ways.

Ans D. I chose C why is C wrong and D correct
Someone argues that the expert's claim is incorrect -- his only source
for the argument is that the bird's fossils are much much older than
the dromeo's fossils.

Hence the assumption is that the fossils correctly indicate the dates
of origin. Hence D.

A - The expert doesn't comment on similarities. Rule this one out.

B - No mention of common ancestors. Incorrect

C - We don't need "complete" knowledge. We just need to know if
the dates on the fossils are indicative of the origins

D - correct

E - Out of scope

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