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The dry mountain ranges of the western United States

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The dry mountain ranges of the western United States [#permalink]

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New post 26 Aug 2017, 21:19
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Question 1
00:00
A
B
C
D
E

Question Stats:

21% (02:09) correct 79% (01:48) wrong based on 133

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Question 2
00:00
A
B
C
D
E

Question Stats:

9% (00:40) correct 91% (00:46) wrong based on 127

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Question 3
00:00
A
B
C
D
E

Question Stats:

79% (00:36) correct 21% (00:17) wrong based on 116

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The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life. This rock record provides clues about one of the most significant radiations (periods when existing life-forms gave rise to variations that would eventually evolve into entirely new species) in the history of marine invertebrates. During this radiation the number of marine biological families increased greatly, and these families included species that would dominate the marine ecosystems of the area for the next 215 million years. Although the radiation spanned tens of millions of years, major changes in many species occurred during a geologically short time span within the radiation and, furthermore, appear to have occurred worldwide, suggesting that external events were major factors in the radiation. And , in fact, there is evidence of major ecological and geological changes during this period: the sea level dropped drastically and mountain ranges were formed, in this instance, rather than leading to large-scale extinctions, these kinds of environmental changes may have resulted in an enriched pattem of habitats and nutrients, which in turn gave rise to the Ordovician radiation. However, the actual relationship between these environmental factors and the diversification of life forms is not yet fully understood

Q4: The passage is primarily concerned with

A. evaluating the evidence of a major geologic period and determining its duration
B. describing an evolutionary phenomenon and speculating about its cause
C. explaining the mechanisms through which marine life-forms evolved during a particular period
D. analyzing the impact on later life-forms of an important evolutionary development
E. contrasting a period of evolutionary change with other such periods
[Reveal] Spoiler: OA
C



Q5. Which of the following can be inferred from the passage regarding the geologic changes that occurred during Ordovician period?

A. They were more drastic than those associated with other radiations
B. They may have created conditions favorable to the evolution of many new life-forms
C. They may have caused the extinction of many of the marine species living in shallow waters
D. They may have been a factor in the development of new species adapted to living both on land and in water
E. They hastened the formation of the extensive dry regions found in the western united states
[Reveal] Spoiler: OA
E



Q6. Which of the following best describes the function of last sentence of the passage ?

A. it points out that the events described in the passage may be atypical
B. it alludes to the fact that there is disagreement in the scientific community over the importance of the Ordovician radiation
C. it concludes that the evidence presented in the passage is insufficient to support the proposed hypothesis because it comes from a limited geographic area
D. it warns the reader against seeing a connection between the biological and geolgic changes described in the passage
E. it alerts the reader that current knowledge cannot completely explain the relationship suggested by the evidence presented in the passage
[Reveal] Spoiler: OA
E



[Reveal] Spoiler:
can some one help exlain why Q5 is E not B?
[Reveal] Spoiler: Question #1 OA
[Reveal] Spoiler: Question #2 OA
[Reveal] Spoiler: Question #3 OA

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Last edited by broall on 28 Aug 2017, 07:20, edited 3 times in total.
Reformatted question

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Re: The dry mountain ranges of the western United States [#permalink]

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New post 30 Aug 2017, 01:57
For Q5: what i think option B is clearly stated in the passage that "such changes gives rise to favorable conditions for development of species rather than their extinction"......option E can be inferred too. But I feel B is better than E ??

Please suggest.

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Re: The dry mountain ranges of the western United States [#permalink]

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New post 30 Aug 2017, 06:21
I selected answer of 1st and 2nd question as B. Could you please help me understand the answers. Also,how to deal with such passages in real exam. Please provide with some tips for RC.

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Re: The dry mountain ranges of the western United States [#permalink]

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New post 30 Aug 2017, 09:16
IIMC wrote:
For Q5: what i think option B is clearly stated in the passage that "such changes gives rise to favorable conditions for development of species rather than their extinction"......option E can be inferred too. But I feel B is better than E ??

Please suggest.


The geological changes did not bring up the new species, the radiation did.

So for Q5, only E can be inferred :-)
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Re: The dry mountain ranges of the western United States [#permalink]

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New post 31 Aug 2017, 09:37
gayatriv21

for first question, I too initially jumped to B in a haste just focusing on a first part of the choice "describing an evolutionary phenomenon" -
but author is not speculating about its cause - author is clearly mentioning the causes.
Hence C is the correct choice
Q4: The passage is primarily concerned with
A. evaluating the evidence of a major geologic period and determining its duration - not evidence of major geological period, focus is evidence of marine life forms - "eventually evolve into entirely new species) in the history of marine invertebrates"
B. describing an evolutionary phenomenon and speculating about its cause
C. explaining the mechanisms through which marine life-forms evolved during a particular period
CORRECT - first line "evidence of tropical marine life"
D. analyzing the impact on later life-forms of an important evolutionary development -> author is not analyzing impact on later life forms but is discussing about the most significant radiations period
E. contrasting a period of evolutionary change with other such periods -> no other periods discussed and contrasted

Second question is explained above by streetking why E is better than B, rest all options are iffy
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Re: The dry mountain ranges of the western United States [#permalink]

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New post 07 Sep 2017, 19:27
YangYichen wrote:
The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life. This rock record provides clues about one of the most significant radiations (periods when existing life-forms gave rise to variations that would eventually evolve into entirely new species) in the history of marine invertebrates. During this radiation the number of marine biological families increased greatly, and these families included species that would dominate the marine ecosystems of the area for the next 215 million years. Although the radiation spanned tens of millions of years, major changes in many species occurred during a geologically short time span within the radiation and, furthermore, appear to have occurred worldwide, suggesting that external events were major factors in the radiation. And , in fact, there is evidence of major ecological and geological changes during this period: the sea level dropped drastically and mountain ranges were formed, in this instance, rather than leading to large-scale extinctions, these kinds of environmental changes may have resulted in an enriched pattem of habitats and nutrients, which in turn gave rise to the Ordovician radiation. However, the actual relationship between these environmental factors and the diversification of life forms is not yet fully understood

Q4: The passage is primarily concerned with

A. evaluating the evidence of a major geologic period and determining its duration
B. describing an evolutionary phenomenon and speculating about its cause
C. explaining the mechanisms through which marine life-forms evolved during a particular period
D. analyzing the impact on later life-forms of an important evolutionary development
E. contrasting a period of evolutionary change with other such periods
[Reveal] Spoiler: OA
C



Q5. Which of the following can be inferred from the passage regarding the geologic changes that occurred during Ordovician period?

A. They were more drastic than those associated with other radiations
B. They may have created conditions favorable to the evolution of many new life-forms
C. They may have caused the extinction of many of the marine species living in shallow waters
D. They may have been a factor in the development of new species adapted to living both on land and in water
E. They hastened the formation of the extensive dry regions found in the western united states
[Reveal] Spoiler: OA
E



Q6. Which of the following best describes the function of last sentence of the passage ?

A. it points out that the events described in the passage may be atypical
B. it alludes to the fact that there is disagreement in the scientific community over the importance of the Ordovician radiation
C. it concludes that the evidence presented in the passage is insufficient to support the proposed hypothesis because it comes from a limited geographic area
D. it warns the reader against seeing a connection between the biological and geolgic changes described in the passage
E. it alerts the reader that current knowledge cannot completely explain the relationship suggested by the evidence presented in the passage
[Reveal] Spoiler: OA
E



[Reveal] Spoiler:
can some one help exlain why Q5 is E not B?


Can you please provide the OEs?

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Re: The dry mountain ranges of the western United States [#permalink]

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New post 08 Sep 2017, 05:27
Hi experts,
Can you please explain answers to Q1 and Q2.

Thanks

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The dry mountain ranges of the western United States [#permalink]

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New post 11 Sep 2017, 00:02
Requesting experts to look into this passage.
I don't agree with the OAs for Q1 and Q2.

Q1. the passage is clearly trying to speculate what could be the causes for the evolution of many life forms.
B. describing an evolutionary phenomenon and speculating about its cause . this is inline with what the passage says.
c is definitive . No where in the passage the passage we see any mechanism being explained but merely speculation is going on .
The last sentences of the passage also says the same
"these kinds of environmental changes may have resulted in an enriched pattem of habitats and nutrients, which in turn gave rise to the Ordovician radiation. However, the actual relationship between these environmental factors and the diversification of life forms is not yet fully understood"

As for Q2
OA given is E but the first sentence merely suggests it contains rocks from that period . We have information that suggest mountain ranges were formed because of geological changes but nothing about dry mountain ranges.
B on the other hand can be inferred from "and , in fact, there is evidence of major ecological and geological changes during this period: the sea level dropped drastically and mountain ranges were formed, in this instance, rather than leading to large-scale extinctions, these kinds of environmental changes may have resulted in an enriched pattern of habitats and nutrients"
Also "may have resulted in an enriched pattern of habitats and nutrients" this suggests that the mountains may not have been dry hence IMO E is not right .
hence i feel B is better.

Please let me know if my analyses is right .

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The dry mountain ranges of the western United States   [#permalink] 11 Sep 2017, 00:02
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