d.They were forced to move constantly to find food
Hunter-gather societies are typically nomadic. This means the societies often had to move to follow the movements of the animal(s) they hunted. The societies needed to be able to move to new settlements as the animals moved.
Native American tribes living in the American Plains were hunter-gatherer societies. They followed the buffalo herds to provide resources and food for their tribes. The tribes typically had a summer and winter settlement meaning every 6 months they were picking up all of their items and moving. All of their items had to be carried by foot with all possessions fitting on their person or in bundles.
