A team at University College London showed that the speed of evolution of placental mammals -- including humans- was stable in presence of dinosaurs and increased drastically after their extinction. An other team from UCL showed last year that the mammal diversity exploded after dinosaur extinction. I believe that these two studies show that the removal of the selection pressure, which was the presence of dinosaurs, allowed mammal evolution to flourish. I would love to know more from your side as I am not an expert in this domain.
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