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# Birds have been said to be descended from certain birdlike dinosaur

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Re: Birds have been said to be descended from certain birdlike dinosaur  [#permalink]

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15 May 2018, 09:38
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AbdurRakib wrote:
Birds have been said to be descended from certain birdlike dinosaur species with which they share distinctive structural features. The fossil record, however, shows that this cannot be so, since there are bird fossils much older than the earliest birdlike dinosaur fossils that have been found.

Which of the following is an assumption on which the argument relies?

A) The birdlike dinosaurs have no descendants.
B) There are no flightless dinosaur species that have the distinctive structural features shared by birds and birdlike dinosaurs.
C) There are no birdlike dinosaur fossils that are older than the bird fossils but have not yet been unearthed.
D) It could not have been the case that some birds were descendant from one of the bird like dinosaur species and other birds from another.
E) Birds cannot have been descended from dinosaur species with which the birds do not share the distinctive structural features.

OG 2017 New Question

There is a small mistake in option a missing living which needed to be along with descendants .

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Re: Birds have been said to be descended from certain birdlike dinosaur  [#permalink]

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15 May 2018, 09:46
tejyr wrote:
AbdurRakib wrote:
Birds have been said to be descended from certain birdlike dinosaur species with which they share distinctive structural features. The fossil record, however, shows that this cannot be so, since there are bird fossils much older than the earliest birdlike dinosaur fossils that have been found.

Which of the following is an assumption on which the argument relies?

A) The birdlike dinosaurs have no descendants.
B) There are no flightless dinosaur species that have the distinctive structural features shared by birds and birdlike dinosaurs.
C) There are no birdlike dinosaur fossils that are older than the bird fossils but have not yet been unearthed.
D) It could not have been the case that some birds were descendant from one of the bird like dinosaur species and other birds from another.
E) Birds cannot have been descended from dinosaur species with which the birds do not share the distinctive structural features.

OG 2017 New Question

There is a small mistake in option a missing living which needed to be along with descendants .

Posted from my mobile device

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Re: Birds have been said to be descended from certain birdlike dinosaur  [#permalink]

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06 Sep 2018, 05:36
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Quote:
Birds have been said to be descended from certain birdlike dinosaur species with which they share distinctive structural features. The fossil record, however, shows that this cannot be so, since there are bird fossils that are much older than the earliest birdlike dinosaur fossils that have been found.

Premises: Birds have been said to be descended from certain birdlike dinosaur species with which they share distinctive structural features.
Conclusion: The fossil record, however, shows that this cannot be so... (i.e. birds cannot have been descended from certain birdlike dinosaur species with which they share distinctive structural features.)
Support to the conclusion: since there are bird fossils that are much older than the earliest birdlike dinosaur fossils that have been found.

Which of the following is an assumption on which the argument relies?
Assumption: Which is the bridge between the conclusion and premises. Without the assumption being true the conclusion falls apart.

Quote:
(A) The birdlike dinosaurs have no living descendants.

They have living dependent or not, doesn't really matters. They do or not, conclusion still stands TALL.

Quote:
(B) There are no flightless dinosaur species that have the distinctive structural features shared by birds and birdlike dinosaurs.

Flightless dinosaur Firstly, aren't of much concern here, as the argument mentions only birdlike dinosaur. Even if they are, they don't hurt the conclusion.

Quote:
(C) There are no birdlike dinosaur fossils that are older than the bird fossils but have not yet been unearthed.

This sounds legitimate, if there are NO birdlike fossils that are older than the bird fossils, then the conclusion stands TALL. As this answer option supports the conclusion.
BUT
If I negate this and say "There ARE birdlike dinosaur fossils that are older than the bird fossils but have not yet been unearthed."
Then the conclusion falls apart.
KEEP C

Quote:
(D) It could not have been the case that some birds were descended from one of the birdlike dinosaur species and other birds from another.

If this is the case, that all birds descended from same birdlike dinosaur species. This still doesn't affect the conclusion, which says that "birds cannot have been descended from certain birdlike dinosaur species with which they share distinctive structural features"

Quote:
(E) Birds cannot have been descended from dinosaur species with which the birds do not share the distinctive structural features.

Even If it says that "Birds cannot have been descended from dinosaur species with which the birds do not share the distinctive structural features." The author still says, whomsoever they descended from, they didn't descend from birdlike dinosaur.

Option C is the best.
Re: Birds have been said to be descended from certain birdlike dinosaur &nbs [#permalink] 06 Sep 2018, 05:36

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# Birds have been said to be descended from certain birdlike dinosaur

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