Why are we certain there was no land bridge to dinosaurs walk across the atlantic ocean from south america to africa?

Because of pangea we are certain that there was no land bridge. pangea was supercontinent that existed during the late Paleozoic and early Mesozoic eras. It assembled from earlier continental units approximately 300 million years ago, and it began to break apart about 175 million years ago.

Answer the collision of tectonic plates;

He introduced the separation of religion and government