[ratg13]

As a person who is uneducated on this, I’ve always wondered if it isn’t also something to do with large objects that have collided into in the past .. these things would essentially wipe out most everything on the ground planet and force things to re-evolve again and that is why we see similar patterns .. like Carcinisation [0]

[0] https://en.wikipedia.org/wiki/Carcinisation

[mcv]

It's not asteroid extinction that's causing convergent evolution. All those crabs, anteaters and trees still exist. They're simply very effective forms.