4 ms·

The ocean floor has "almost no oxygen," not "no oxygen." There remain oxygen-burning creatures adapted to living beneath in hypoxic conditions.

• TheSpiceIsLife 7y ago
  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.
  • akiselev 7y ago
    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/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5829614/ [2] https://web.stanford.edu/group/MicheliLab/pdf/oceanographicandbiologicaleffectsofshoaling.pdf https://web.stanford.edu/group/MicheliLab/pdf/oceanographica...
    • eloff 7y ago
      Where does the oxygen at the bottom of the ocean come from I wonder?