Plant evolution is anything but stable. They keep evolving and devolving from weeds to trees and back every few 100 generations.

Plants keep evolving and devolving into trees every 100 generations.

I came here to day this, but you were more eloquent than I could ever be

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The issue is not more/less salt in the oceans, but fewer and less reliable sources of freshwater.

Hey, look a feature every mammal may need to evolve in the near future!

Physics books are never outdated, you just discover better models that work in a wider range of conditions.