They travelled along water sources. Land explorers followed rives, while explorers by sea kept close to land. It is that way so explorers of land may have a water source to drink from or bathe in. Travelling far enough away would be a death wish.
Cancer cells infection growth called abnormal cells
I believe it was the ability to share information on who to trust- in other words, gossip. There was probably a multitude of things that set them apart, though, so Imight be incorrect.
Answer:
Poverty Level would be the answer to your question.
(^_^)
