bridges connect land masses
The men in the Paleolithic era didn't have much technology.
land bridges
Mesosaurus fossils
Land bridges aren't actually formed, they are already there but covered by the sea. When a glacial period starts, the water evaporated from the oceans falls as snow on the land and then compacts as ice which does not melt. Continual removal of water from the oceans over thousands of years causes sea level to drop and exposes the "land bridges".
Maybe maybe not
teepees
No, we have no evidence of this.
The Sinai Peninsula is a land of dry deserts that bridges the continents of Africa and Asia. It is located in Egypt and is bordered by the Mediterranean Sea to the north and the Red Sea to the east.
The Aztecs adapted to their land by Chinampas, Building Bridges, and Hunting animals
They were already formed but the were covered with water.
I use Plastruct for modelling bridges.