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MMLU-Pro / 4864 / Which of the following is not a hypothesis for why hominids walked on two legs?

Problem

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question

Which of the following is not a hypothesis for why hominids walked on two legs?

category

history

options

  1. it expended less energy than quadrupedalism for going long distances
  2. it freed the hands to carry things
  3. it allowed hominids to see greater distances
  4. it provided a more intimidating posture to potential predators
  5. it allowed for better heat regulation
  6. it allowed for braincase expansion

src

ori_mmlu-prehistory

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Source and history

Official source

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