Identify three reasons prehistoric hunter-gatherers tended to move often.
A. Plants they could eat or use for making goods grew in different places.
B. They had to seek out specialized craftspeople to get certain tools.
C. Dangerous animals were attracted to the cities they lived in.
D. Environmental changes made some places easier to live in than others.
E. They had to follow herds of animals for food and skins.
OF. Their crops often failed because of flooding and dry spells.