From Newsgroup: talk.origins


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 plantsrCoprecursors to
Earth's first forests.

That rise in oxygen coincided with a period of
remarkable diversification among fish with jawsrCothe
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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