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Isn't evolution a constant process instead of happening in steps?
I think the question is how often it evolved independently like bird and bat wings evolved independently
Add flying fish to that.
That makes a lot more sense then. Thank you, happy to learn something new.
I forget where I saw this, but trees are kind of like crabs, in that they've convergently evolved many, many, many different times. Pretty interesting!
Also pterosaur wings.
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