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Paleontologists studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that have ever existed.
a) studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that
b) that study the fossil record have estimated that the current collection of known fossils is only 10% of all species that
c) studying the fossil record have estimated that the current collection of known fossils accounts for only 10% of all species that
d) who study the fossil record have estimated that the fossils currently collected are only approximately 10% of all species which
e) who study the fossil record estimate that the current collection of known fossils accounts for approximately 10% of all species which
Please explain your answer
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Originally posted by tarek99 on 29 Nov 2007, 10:13.
Last edited by tarek99 on 29 Nov 2007, 10:17, edited 1 time in total.
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The OA is C. Why? because in the original sentence, the word "estimate" and "approximately" are redundant. Also, although using either "that study" or "who study" could be appropriate, using the present participle "studying" is generally considered more concise.
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