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MMLU / About 2.6 to 1.9 million years ago the planet became much _____ and entered the…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

About 2.6 to 1.9 million years ago the planet became much _____ and entered the ______:

choices

  1. colder; Pleistocene epoch.
  2. hotter; Miocene epoch.
  3. colder; Pliocene epoch.
  4. hotter; Pleistocene epoch.

subject

prehistory

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Source and history

Official source

initial import