With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms.

Question

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The rise of oxygen in Earth's atmosphere due to photosynthesis led to the Great Oxidation Event, which was toxic to many anaerobic organisms, causing mass extinctions.

With the Advent of Photosynthesis and the Subsequent Production of Oxygen