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MMLU / According to the heterotroph hypothesis, which event had to occur before oxygen…

Problem

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question

According to the heterotroph hypothesis, which event had to occur before oxygen filled the atmosphere?

choices

  1. Heterotrophs had to remove carbon dioxide from the air.
  2. Autotrophs, which make their own food, had to evolve.
  3. Heterotrophs had to evolve.
  4. Autotrophs had to convert atmospheric nitrogen to nitrate.

subject

high_school_biology

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Official source

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