Submitted by CR1MS4NE t3_z73zne in explainlikeimfive
Lithuim t1_iy5gyzv wrote
Reply to comment by Skialper in ELI5: why fish can’t breathe in air despite air having plenty of oxygen by CR1MS4NE
Nope, they're extracting oxygen gas that's dissolved in the water, not the O from H2O.
That's a much more difficult process.
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