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Scientists have dated sharp-edged flakes of stone found in

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Joined: 27 May 2010
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Scientists have dated sharp-edged flakes of stone found in [#permalink]

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New post 28 Aug 2010, 14:43
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Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments
of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million
years ago, pushing back by more than 150,000 years the earliest date when it is
known that humans made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[Reveal] Spoiler: OA

Kudos [?]: 223 [0], given: 1

Scientists have dated sharp-edged flakes of stone found in   [#permalink] 28 Aug 2010, 14:43
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Scientists have dated sharp-edged flakes of stone found in

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