The name of the ice age land bridge between Russia and North American Continent

The Bering land bridge is a postulated route of human migration to the Americas from Asia about 20,000 years ago.

Explanation:

An open corridor through the ice-covered North American Arctic was too barren to support human migrations before around 12,600 BP.

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation

c. businesses/firms & government