I should have said reptiles and a very few at that. Crocodile and alligators share the “lizard shaped” hips. These are lower to the ground herbivores. However, you are correct that dinosaurs did not evolve In lizards. Other reptiles from 65 million years ago did. Using the common term dinosaur spends many many millions of years and globally. So in a grand idea, this is why North America and South America have such a different span of organisms.

Has far as everything thing that’s related, the only sure way I that happens is to look at the first single cell organism to occurred in the deep ocean while the earth was still cooling.