source: McGraw Hill's Conquering GMAT Verbal and writing
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 �rst 4 billion years of Earth's his-
tory, 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.
If you choose a choice please explain why.
OA-A
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 �rst 4 billion years of Earth's his-
tory, 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.
If you choose a choice please explain why.
OA-A
Last edited by arora007 on Thu Jul 15, 2010 2:45 am, edited 1 time in total.
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