Chicken?
this post was submitted on 20 Apr 2024
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Fish existed first, reptiles evolved from fish. Mammals evolved from reptiles alongside dinosaurs who also evolved from reptiles.
The only dinosaurs that survived the mass extinction 65 million years ago were birds.
Evolution isn't always a forward process. Hence how we have cetaceans and why crabs evolved into existence five separate times.
That doesn't have anything to do with the timeline of fish > reptiles > dinosaur evolution.
That's what I mean by a "forward process". Often people think evolution always goes that one way you describe.