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A comment on Why Is the Ocean Salty?. Parent comment

Re:Why Is the Ocean Salty? by leplen on Sunday September 10, 2023 @11:08PM (#37462418)
It looks like there is a theory that dermal bone in early tetrapods was used this way, but it's still fairly speculative. https://www.nbcnews.com/id/wbna47176272
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Re:Why Is the Ocean Salty? by DoreenMichele on Sunday September 10, 2023 @11:10PM (#37462427)
Thank you:

Breathing air came with challenges, though. A major one was getting rid of the air's carbon dioxide, which, when it builds up, reacts with water in the body and forms an acid.

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