EARLY PEOPLE USED TO WANDER FROM ONE PLACE TO ANOTHER IN SEARCH OF :
FOOD(IN SEARCH OF ANIMALS,PLANTS,AND WATER)
WATER(AS SOME WERE SEASONAL AND SOME WERE PERENNIAL)
FRUIT(AS SOME PLANTS BEAR FRUIT IN DIFFERENT SEASONS)
AND ALSO IN SEARCH OF PLACE WHERE EDIBLE STONE WAS,SO THAT
THEY CAN MAKE SHARPER TOOLS FOR HUNTING.
THIS IS WHY THE USED TO MOVE FROM ONE PLACE TO ANOTHER AND LED A NOMADIC LIFE.