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  • 24-01-2021
  • Biology
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Which evolved first, photosynthesis or cellular respiration?

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  • 24-01-2021

Answer:

Because photosynthesis is a source of oxygen, it seems intuitive that photosynthesis evolved first: once enough O2 was in the air, then respiration would be able to arise in the newly oxygen-enriched atmosphere. However, some biologists have argued since the 1970's that respiration in fact evolved first.

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