Minor nit: is there evidence that dinosaurs evolved into monkeys? didn't they all get wiped out by an asteroid?
AFAIK, mammals existed during the dinosaur era. But they occupied a tiny ecological niche and were physically tiny. They survived the asteroid hit because they were tiny.
The absence of dinos enabled them to eventually occupy niches occupied by dinos.
AFAIK, mammals existed during the dinosaur era. But they occupied a tiny ecological niche and were physically tiny. They survived the asteroid hit because they were tiny.
The absence of dinos enabled them to eventually occupy niches occupied by dinos.