Respuesta :

computerrealm3

Answer:

Drought, flood, and temperature changes could certainly push people to move on.

Explanation:

Climate change also affects the food supply, and anthropologists have assumed that people came to the Americas because they were following food on the hoof.

klynnrichardson

Answer:

The ice covering most of the northern part of North America melted.

Explanation:

The land bridge allowed humans to reach North America, but they couldn't move farther south until the ice started to melt.