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A comment on An animal that doesn't breathe oxygen. Parent comment

Re:An animal that doesn't breathe oxygen by arkades on Tuesday March 24, 2020 @12:09PM (#22675771)
The ocean floor has "almost no oxygen," not "no oxygen." There remain oxygen-burning creatures adapted to living beneath in hypoxic conditions.
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Re:An animal that doesn't breathe oxygen by TheSpiceIsLife on Tuesday March 24, 2020 @03:18PM (#22677945)
I dunno if hypoxic is the right term here as it’s usually taken to mean oxygen deprivation / insufficiency, which isn’t what’s happening here, as evidenced by organisms being adapted to the conditions.
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Re:An animal that doesn't breathe oxygen by akiselev on Tuesday March 24, 2020 @06:01PM (#22679521)
The oxygen concentration is actually quite a bit higher in most hadal zones (> 150 µmol/kg [1]) than oxygen minimum zones that exist in the middle layers (< 45 µmol/kg [2]). It's definitely not a hypoxic environment relative to the rest of the ocean.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5829614/

[2] https://web.stanford.edu/group/MicheliLab/pdf/oceanographica...

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Re:An animal that doesn't breathe oxygen by eloff on Tuesday March 24, 2020 @09:05PM (#22680923)
Where does the oxygen at the bottom of the ocean come from I wonder?
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