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MMLU / Based on the analysis of oxygen isotope ratios in the shells of gastropods found…

Problem

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question

Based on the analysis of oxygen isotope ratios in the shells of gastropods found in the sediments of an ancient lake, what happened to civilization in the Indus Valley?

choices

  1. It became increasingly complex due to increased rainfall and longer growing seasons.
  2. It eventually collapsed due to climate change and drought.
  3. It collapsed due to increased monsoons and a series of catastrophic floods.
  4. It evolved into a series of city states along rivers and lake shores.

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