From: invalide@invalid.invalid   
      
   https://phys.org/news/2025-08-deep-ocean-oxygen-marine-habitats.html   
      
   Some 390 million years ago in the ancient ocean,   
   marine animals began colonizing depths previously   
   uninhabited. New research indicates this underwater   
   migration occurred in response to a permanent   
   increase in deep-ocean oxygen, driven by the   
   above-ground spread of woody plants—precursors to   
   Earth's first forests.   
      
   That rise in oxygen coincided with a period of   
   remarkable diversification among fish with jaws—the   
   ancestors of most vertebrates alive today. The   
   finding suggests that oxygenation might have shaped   
   evolutionary patterns among prehistoric species.   
   ...   
      
      
   https://www.pnas.org/doi/10.1073/pnas.2501342122   
   Mid-Devonian ocean oxygenation enabled the   
   expansion of animals into deeper-water habitats   
      
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