How dramatic daily swings in oxygen shaped early animal life

PHYSorg
Mar 24, 2025, 12:26 pm112 pts
Imagine a world where the oxygen you need changes dramatically between day and night. Your world shifts from being rich in oxygen (oxic) in the day, so you have energy to hunt for food, to suffocatingly oxygen-free (anoxic) at night, which slows you down.

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