According to scientists, what caused a land bridge to connect Asia and North America thousands of years ago?

A series of large earthquakes pushed the land upward.

So much water was frozen in glaciers that sea levels dropped.

Early people built a long bridge to cross the ocean.

Volcanic eruptions created a new strip of land between the continents.

What was the main way of life for the first groups of people who migrated into North America?

They were farmers who grew corn and beans.

They were sailors who lived on the ocean.

They were hunters who followed animal herds.

They were builders who created large temples.