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ARC-Challenge / Mercury_7230388 / The types of organisms on Earth changed as a result of increased levels of…

Problem

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

question

The types of organisms on Earth changed as a result of increased levels of atmospheric oxygen. Which process contributed to this buildup of oxygen in Earth's atmosphere?

choices

  • metabolic production of methane
  • production of nitrates from inorganic nitrogen
  • aerobic breakdown of sugars to release energy
  • transformation of light energy into chemical bond energy

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Source and history

Official source

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