last ice age --> lage parts of North America, Europe and Asia were covered with ice.
Temperature rose --> ice age receded --> Northern Europe became a pleasanter place to live ==> hunter gatherers arrived.
Most of their tools were made of stone ==> Early Stone Age/ Paleolithic age.
People lived in groups who traveled were food was ==> nomads --> they lived in tents/ huts or caves.
Men/ boys hunted, women and smaller children gathered.