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Schools: Harvard '24 Judge '23 LBS '24 McCombs '24 Mendoza Tepper '24 Ross '24 Cox Marshall '24 Fisher Kelley '24 Jones McDonough '24 Owen '24 Terry BU Simon '24 Katz GWU Mason Babson Gabelli Foster '24 Goizueta '24 Scheller Stern '23 CBS '23 Booth '23 Haas '25 Wharton '25 Stanford '26 Johnson'23 Fuqua '23 Kellogg '23 Kenan-Flagler'23 INSEAD Aug 22 intake Olin '23 Said '23 Sloan '23 Carey Arizona "22 Yale '23 UC Davis Madison '23 Anderson '23 Carroll Carlson '23 Darden '23
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24 Mar 2017, 19:58
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
40% (02:08) correct
60%
(02:15)
wrong
based on 338
sessions
History
Date
Time
Result
Not Attempted Yet
Most biologists agree that evolution takes place extremely slowly, with species requiring millions and millions of years to accumulate enough small changes to gradually transform into new ones. For the first 4 billion years of Earth’s history, the only species known were bacteria, plankton, and algae. But the fossil record indicates that during a brief 30 million year span known as the Cambrian explosion, the eventual lineages of all major animal groups alive today appeared.
Which of the following, if true, provides at least a partial explanation for the discrepancy outlined above?
A. The fossil record only represents a small portion of the species alive at any given time.
B. The fossil record indicates a number of major extinction events in Earth’s history.
C. Some of the lineages found in the fossil record of the Cambrian explosion are no longer alive today.
D. Bacteria, plankton, and algae leave little evidence in the fossil record because of their physical structures.
E. The fossil record indicates a large diversity in the plant species inhabiting the Earth during the Cambrian explosion.
Source: McGraw-Hill's GMAT
Which of the following, if true, provides at least a partial explanation for the discrepancy outlined above?
A. The fossil record only represents a small portion of the species alive at any given time.
B. The fossil record indicates a number of major extinction events in Earth’s history.
C. Some of the lineages found in the fossil record of the Cambrian explosion are no longer alive today.
D. Bacteria, plankton, and algae leave little evidence in the fossil record because of their physical structures.
E. The fossil record indicates a large diversity in the plant species inhabiting the Earth during the Cambrian explosion.
Source: McGraw-Hill's GMAT
05 Apr 2017, 05:46
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Good Question.
Statement 1: Evolution happens very slowly. Over several million years, a small change is transformed into a new ones.
Statement 2: Cambrian saw very big changes in just 30 million year span.
We need to find something that could help us clarify this discrepancy.
Best way to solve this question is to do POE.
B. The fossil record indicates a number of major extinction events in Earth’s history. : It no where tells us why they changed so much.
C. Some of the lineages found in the fossil record of the Cambrian explosion are no longer alive today. Fine, but what happened at that time?
D. Bacteria, plankton, and algae leave little evidence in the fossil record because of their physical structures. We are not concerned about these.
E. The fossil record indicates a large diversity in the plant species inhabiting the Earth during the Cambrian explosion. We already know this. This doesn't tell us why that happened.
A. The fossil record only represents a small portion of the species alive at any given time. : Ok, it means fossil records are not providing sufficient information. Although I donot agree with this option too much, I am 100% sure that other 4 are incorrect. Therefore, this is the best answer choice to mark.
Statement 1: Evolution happens very slowly. Over several million years, a small change is transformed into a new ones.
Statement 2: Cambrian saw very big changes in just 30 million year span.
We need to find something that could help us clarify this discrepancy.
Best way to solve this question is to do POE.
B. The fossil record indicates a number of major extinction events in Earth’s history. : It no where tells us why they changed so much.
C. Some of the lineages found in the fossil record of the Cambrian explosion are no longer alive today. Fine, but what happened at that time?
D. Bacteria, plankton, and algae leave little evidence in the fossil record because of their physical structures. We are not concerned about these.
E. The fossil record indicates a large diversity in the plant species inhabiting the Earth during the Cambrian explosion. We already know this. This doesn't tell us why that happened.
A. The fossil record only represents a small portion of the species alive at any given time. : Ok, it means fossil records are not providing sufficient information. Although I donot agree with this option too much, I am 100% sure that other 4 are incorrect. Therefore, this is the best answer choice to mark.
08 Apr 2017, 14:37
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Hi Can anybody please explain why the ans is 'B'? I did not much get the question.
