Answer:
They used stones, tree branches, and leaves to survive the climate.
Explanation:
The climate during the early Paleolithic age were warm. But it got colder as they move closer to the ice age period. At that time, humans still haven't developed the ability to create sharp tools from metals. So they can't produce fur coats to survive the cold weather.
In order to survive the changing climate, they built a very simple shelter using the combination of stones, tree branches , and leaves. (Humans' intellect haven't developed to make a more advanced shelter during this time period_
